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All-new 2024

  • Redesigned chassis offers short and long configurations to adjust wheelbase and weight balance to match any track conditions
  • Front & Rear LSM arms in Medium composite provide better crash durability and are suitable for all conditions
  • Steering Blocks & C-hubs are also moulded from new medium composite hardness for extra reliability and crash resistance
  • New rear uprights feature lowered roll center positions to improve stability and reduce suspension collapse in high speed corners
  • All-new big bore 13.2mm shock design features new shock bodies, 2.0 and 2.5mm piston choices, shock caps, nuts and shock shafts
  • The 13.2mm shocks use a new X-ring design for improved seal without excess friction for improved shock operation
  • New conical springs have been selected to work with the new 13.2mm shock package
  • Front shock tower with wider positions increases the set-up adjustment range for different track conditions
  • The rear shock tower with lowered shock positions improves roll characteristics and increases cornering speed
  • Redesigned side guards reinforce the rear section of the chassis
  • Front and rear differentials at XB4C use steel satellite gears for improved efficiency and increased lifespan
  • New ‘Lush’ rear wing with significantly increased lifespan improves airflow and maintains chassis attitude over large jumps while improving traction in all conditions
  • 30mm Fan Holder for additional ventilation

XRAY XB4'24 All-new Features:

  • Redesigned chassis offers short and long configurations to adjust wheelbase and weight balance to match any track conditions
  • Front & Rear LSM arms in Medium composite provide better crash durability and are suitable for all conditions
  • Steering Blocks & C-hubs are also moulded from new medium composite hardness for extra reliability and crash resistance
  • New rear uprights feature lowered roll center positions to improve stability and reduce suspension collapse in high speed corners
  • All-new big bore 13.2mm shock design features new shock bodies, 2.0 and 2.5mm piston choices, shock caps, nuts and shock shafts
  • The 13.2mm shocks use a new X-ring design for improved seal without excess friction for improved shock operation
  • New conical springs have been selected to work with the new 13.2mm shock package
  • Front shock tower with wider positions increases the set-up adjustment range for different track conditions
  • The rear shock tower with lowered shock positions improves roll characteristics and increases cornering speed
  • Redesigned side guards reinforce the rear section of the chassis
  • Front and rear differentials at XB4C use steel satellite gears for improved efficiency and increased lifespan
  • New ‘Lush’ rear wing with significantly increased lifespan improves airflow and maintains chassis attitude over large jumps while improving traction in all conditions
  • 30mm Fan Holder for additional ventilation

World Champions.

At the World’s most competitive off-road race – the IFMAR World Championship, it was XRAY’s Bruno Coelho and Daniel Kobbevik securing another World Champion and Junior Champion titles for the XB4 platform.

XRAY XB4 – the 4x World Champion 1/10 off-road 4WD car that will bring you to the Winners’ Circle.

World Champions.

At the World’s most competitive off-road race – the IFMAR World Championship, it was XRAY’s Bruno Coelho and Daniel Kobbevik securing another World Champion and Junior Champion titles for the XB4 platform.

XRAY XB4 – the 4x World Champion 1/10 off-road 4WD car that will bring you to the Winners’ Circle.

USA Champion.

XRAY’s Ty Tessmann achieved the first ROAR National Championship for the XB4. Tested and successfully run in the highest competition races now you can enjoy the winning platform.

USA Champion.

XRAY’s Ty Tessmann achieved the first ROAR National Championship for the XB4. Tested and successfully run in the highest competition races now you can enjoy the winning platform.

European Champions.

With ongoing development of the XB4 platform, Team XRAY continues to win at the highest competition levels including the European Championship. The XB4 is a multi-time European Champion as well the European Junior Champion.

European Champions.

With ongoing development of the XB4 platform, Team XRAY continues to win at the highest competition levels including the European Championship. The XB4 is a multi-time European Champion as well the European Junior Champion.

Philosophy.

At the heart of XRAY's philosophy is a firm commitment to perfection in engineering, design, performance and support… all made possible by state-of-the-art in-house manufacturing. The XB4 is the epitome of perfection that is typical for XRAY.

Dipl. Eng. Juraj Hudy
XRAY Chief Designer

Made in Europe.

Engineered and manufactured in-house at the XRAY factory located in Slovakia, Europe, the XB4 is a fantastic demonstration of XRAY’s attention to detail in all of its products. The XB4 is created by XRAY’s design staff using premium European materials and sophisticated German and Swiss machines.

Uni-Platform™.

The XB4 platform works at the highest competition level in any track conditions, whether it be super-low-traction dusty tracks, medium-traction, or super-high-traction carpet or astro turf; there is an XB4 for you that will handle flawlessly in any of these conditions.

There are two different XB4 kits to choose from – Carpet Edition and Dirt Edition, both built on the same platform with full compatibility with interchangeable parts.

The Carpet Edition is designed for medium to very-high traction conditions, while the Dirt Edition is designed for very-low to medium traction conditions.

The Uni-Platform™ allows either version of the XB4 to be tuned or converted to suit any track conditions with only a few additional parts.

Uni-Platform™.

The XB4 platform works at the highest competition level in any track conditions, whether it be super-low-traction dusty tracks, medium-traction, or super-high-traction carpet or astro turf; there is an XB4 for you that will handle flawlessly in any of these conditions.

There are two different XB4 kits to choose from – Carpet Edition and Dirt Edition, both built on the same platform with full compatibility with interchangeable parts.

The Carpet Edition is designed for medium to very-high traction conditions, while the Dirt Edition is designed for very-low to medium traction conditions.

The Uni-Platform™ allows either version of the XB4 to be tuned or converted to suit any track conditions with only a few additional parts.

Chassis.

The new XB4 chassis has a narrower front profile with more tapered side pod front edges to reduce scrub on jump faces. The milled pockets are redesigned to allow the motor and center assembly to move frontwards/rearwards to adjust the weight balance for particular track conditions with the fan holder position adjusted accordingly

The chassis features symmetrical flex and multiple battery position choices to adjust the weight balance.

The chassis is an important component that contributes to the XB4’s handling characteristics. The chassis dimensions and flex characteristics are selected for the best blend of stability, traction and steering. The chassis is machined for extra clearance under the bulkheads to accommodate the diff height adjustment feature.         

CNC-machined from high-quality Swiss 2mm 7075 T6 aluminum, the chassis is strategically machined in low-stress areas to make it as light as possible without affecting strength or rigidity; and it is additionally black-coated for increased lifespan.

Chassis.

The new chassis plate includes multiple mounting positions for the rear transmission for a standard or short position to adjust handling to match any track condition.

The redesigned chassis includes standard and short rear transmission positions to fine tune the chassis configuration for different track conditions.

Standard transmission position is suitable in high traction conditions to improve stability.

Shorter transmission position is suitable for lower traction surfaces to increase rear traction.

Extra side guard mounting points were added in the rear of the chassis to increase stiffness and expand the range of flex adjustment settings possible with the new XB4.

Transmission Position.

The new chassis plate includes multiple mounting positions for the rear transmission for a standard or short position to adjust handling to match any track condition.

Standard transmission position is suitable in high traction conditions to improve stability.

Shorter transmission position is suitable for lower traction surfaces to increase rear traction.

Transmission Position.

The new chassis plate includes multiple mounting positions for the rear transmission for a standard or short position to adjust handling to match any track condition.

Standard transmission position is suitable in high traction conditions to improve stability.

Shorter transmission position is suitable for lower traction surfaces to increase rear traction.

Side Guards.

The updated side guard design adds additional rear attachment points that can increase chassis stiffness when screws are installed, expanding the range of chassis flex settings possible on the XB4’24.

The chassis guards have a narrow front profile and chamfered edges to reduce chassis scrub on jump entry, significantly improving consistency and handling over jump features.

Tough composite side guards perfectly fit the chassis to seal against dirt and protect from side impacts.

Molded from a hard composite material, the side guards are an important part of the chassis flex adjustment for the majority of track conditions.

To improve protection against dust, Velcro® double-sided tape is included to ensure a perfect seal of the body to the side guards, and to reduce the noise level of the running car.

Side Guards.

The updated side guard design adds additional rear attachment points that increase chassis stiffness.

The updated side guard design adds additional rear attachment points that can increase chassis stiffness when screws are installed, expanding the range of chassis flex settings possible on the XB4’24.

The chassis guards have a narrow front profile and chamfered edges to reduce chassis scrub on jump entry, significantly improving consistency and handling over jump features.

Tough composite side guards perfectly fit the chassis to seal against dirt and protect from side impacts.

Molded from a hard composite material, the side guards are an important part of the chassis flex adjustment for the majority of track conditions.

To improve protection against dust, Velcro® double-sided tape is included to ensure a perfect seal of the body to the side guards, and to reduce the noise level of the running car.

Gear Differential.

The gear diff in XB4C comes now with steel satellite gears for improved efficiency and increased lifespan. The XB4D gear diff comes with graphite gears for improved traction and acceleration on lower traction surfaces.

The front and rear gear differential features a split design of the cover and crown gear. The differential case has large internal oil volume to increase consistency of the diff action, yet it is significantly narrow in order to move the rotating weight closer to the centerline.

Gear Differential.

The gear diff in XB4C now includes steel satellite gears for improved efficiency and increased life span. Gear diff in XB4D includes graphite gears for improved traction and acceleration on lower traction surfaces.

The gear diff in XB4C comes now with steel satellite gears for improved efficiency and increased lifespan. The XB4D gear diff comes with graphite gears for improved traction and acceleration on lower traction surfaces.

The front and rear gear differential features a split design of the cover and crown gear. The differential case has large internal oil volume to increase consistency of the diff action, yet it is significantly narrow in order to move the rotating weight closer to the centerline.

Suspension Arms.

Suspension arms are molded from a new medium hardness composite mixture to improve reliability and strength. The medium composite provides excellent performance on a variety of conditions with the added benefit of increased strength.

Rear suspension arms accommodate the multi-adjustable uprights. The outer pivot of each arm uses small screws to secure the hinge pins and prevent separation in a crash. This floating hinge pin reduces suspension bind.

There are three different suspension arms available: medium, hard and graphite, each suitable for different track conditions.

Suspension Arms.

Suspension arms are molded from a new medium hardness composite mixture to improve reliability and strength. The medium composite provides excellent performance on a variety of conditions with the added benefit of increased strength.

Suspension arms are molded from a new medium hardness composite mixture to improve reliability and strength. The medium composite provides excellent performance on a variety of conditions with the added benefit of increased strength.

Rear suspension arms accommodate the multi-adjustable uprights. The outer pivot of each arm uses small screws to secure the hinge pins and prevent separation in a crash. This floating hinge pin reduces suspension bind.

There are three different suspension arms available: medium, hard and graphite, each suitable for different track conditions.

Steering Blocks.

Updated steering blocks in a new medium hardness material improve both handling and reliability.

Steering Blocks.

Updated steering blocks in a new medium hardness material improve both handling and reliability.

Caster Blocks.

To improve the reliability and strength, the caster blocks are moulded from medium hardness composite mixture that is suitable for most track conditions. Just like the included steering blocks, the new medium compound significantly improves the reliability and ensures finish a race even after a punishing crash.

The 1-piece caster blocks are very lightweight, yet the construction makes them very stiff and rigid. The non-adjustable caster angle is preset to 9°. Roll center position can be quickly & easily adjusted by inserting different thickness of shims atop the caster block (between the block and the vertical ball stud).

The non-adjustable caster is preset to 9°, however the position of the adjustable eccentric bushings in the I.S.S.™ suspension holders influences the caster as well. (For example, if the eccentric bushings have the roll center in middle position, the caster angle is 9° which when added to the 9° caster block gives a total of 18° caster. The total adjustability range for caster is 16-20°.)

Optional caster blocks with 6° and 12° built-in caster angles are available for further suspension geometry adjustment.

There are four different caster blocks available – medium (included), hard (option), graphite (option) and aluminum (option), each one suitable for different track conditions.

The hard caster blocks increase stability in high-traction conditions, and help to increase cornering speed.

Caster Blocks.

Caster blocks made from a new medium hardness material improve reliability. Different caster blocks hardness choices are available to tune set-up for any track condition.

To improve the reliability and strength, the caster blocks are moulded from medium hardness composite mixture that is suitable for most track conditions. Just like the included steering blocks, the new medium compound significantly improves the reliability and ensures finish a race even after a punishing crash.

The 1-piece caster blocks are very lightweight, yet the construction makes them very stiff and rigid. The non-adjustable caster angle is preset to 9°. Roll center position can be quickly & easily adjusted by inserting different thickness of shims atop the caster block (between the block and the vertical ball stud).

The non-adjustable caster is preset to 9°, however the position of the adjustable eccentric bushings in the I.S.S.™ suspension holders influences the caster as well. (For example, if the eccentric bushings have the roll center in middle position, the caster angle is 9° which when added to the 9° caster block gives a total of 18° caster. The total adjustability range for caster is 16-20°.)

Optional caster blocks with 6° and 12° built-in caster angles are available for further suspension geometry adjustment.

There are four different caster blocks available – medium (included), hard (option), graphite (option) and aluminum (option), each one suitable for different track conditions.

The hard caster blocks increase stability in high-traction conditions, and help to increase cornering speed.

Rear Uprights.

New rear uprights feature updated lower roll center positions that improve stability of the car with less collapse in high-speed corners. There are now two different composite rear uprights with Lower & Higher Roll Center positions.

To improve the reliability and strength, the uprights are moulded from medium hardness composite mixture that is suitable for most track conditions.

Rear uprights feature aluminum roll center mounts with updated roll center position.

The upper roll center is adjusted at the camber linkage via shims (up/down & in/out), while the lower roll center is adjustable via eccentric inserts for 9 different positions (up/down & in/out).

The multi-function uprights have the upper roll center position in the middle of the axis of the driveshaft joint to help generate more traction and increase stability.

There are three different uprights available: hard (included), graphite (optional), and aluminum (optional), each suitable for particular track conditions.

Rear Uprights.

The XB4C comes with new rear uprights with Lower Roll Center Positions to improve stability with less collapse of the suspension in high-speed corners on Carpet or Astro.

The XB4D comes with both uprights with Lower & Higher Roll Center Positions. The lowered roll center uprights are suggested for Astro and high roll center uprights are suggested for dirt conditions.

New rear uprights feature updated lower roll center positions that improve stability of the car with less collapse in high-speed corners. There are now two different composite rear uprights with Lower & Higher Roll Center positions.

To improve the reliability and strength, the uprights are moulded from medium hardness composite mixture that is suitable for most track conditions.

Rear uprights feature aluminum roll center mounts with updated roll center position.

The upper roll center is adjusted at the camber linkage via shims (up/down & in/out), while the lower roll center is adjustable via eccentric inserts for 9 different positions (up/down & in/out).

The multi-function uprights have the upper roll center position in the middle of the axis of the driveshaft joint to help generate more traction and increase stability.

There are three different uprights available: hard (included), graphite (optional), and aluminum (optional), each suitable for particular track conditions.

Big Bore Shocks.

The all-new big bore 13.2mm shocks parts are redesigned for overall handling and performance improvements. The big bore shocks improve landings and provide better control over surface unevenness and bumps to improve traction.

There are two different thickness pistons (2.0 and 2.5mm) included in the kit in pre-drilled and blank alternatives.

The super-efficient pre-oiled X-rings ensure smooth operation and prevent dust inside the shock assembly.

Shock extension is limited using composite shims under the pistons. Maximum compression is limited using composite shims under the shock collar.

The shock absorbers are universal for both Dirt and Carpet edition.

Big Bore Shocks.

All-new big bore 13.2mm shocks improve handling, landing, and bump absorption. New X-rings provide smooth operation & dust resistance. Two different piston thicknesses are included in the kit for tuning along with piston blanks for additional tuning possibilities.

The all-new big bore 13.2mm shocks parts are redesigned for overall handling and performance improvements. The big bore shocks improve landings and provide better control over surface unevenness and bumps to improve traction.

There are two different thickness pistons (2.0 and 2.5mm) included in the kit in pre-drilled and blank alternatives.

The super-efficient pre-oiled X-rings ensure smooth operation and prevent dust inside the shock assembly.

Shock extension is limited using composite shims under the pistons. Maximum compression is limited using composite shims under the shock collar.

The shock absorbers are universal for both Dirt and Carpet edition.

Shock Pistons.

The new piston choices were updated for ideal fit and dampening in the new big bore shock bodies. All-new 2-hole pistons (1.6 and 1.8mm) are included in 2.0mm or 2.5mm thickness alternatives. In addition, two sets of blank pistons in both thickness alternatives are included for individual custom modification.  All pistons are made from Delrin and are molded using ultra-high precision moulds.

Shock Pistons.

The new piston choices were updated for ideal fit and dampening in the new big bore shock bodies. All-new 2-hole pistons (1.6 and 1.8mm) are included in 2.0mm or 2.5mm thickness alternatives. In addition, two sets of blank pistons in both thickness alternatives are included for individual custom modification.  All pistons are made from Delrin and are molded using ultra-high precision moulds.

Shock Springs.

A completely new range of conical springs are available for the new big bore shocks.

Carpet and Dirt edition include 2 complete sets of springs chosen for their intended track conditions.

The XB4 springs, like all other XRAY springs, are manually measured, selected, and matched into pairs to guarantee precisely equal length and damping characteristics.

Each spring is laser-engraved with stripes to clearly indicate its firmness.

Shocks Springs.

A completely new range of conical springs are available for the big bore shocks. Carpet and Dirt edition include 2 complete sets of springs chosen for their intended track conditions. The spring rates are more closely spaced to give smaller tuning increments that allow for easier shock tuning.

A completely new range of conical springs are available for the new big bore shocks.

Carpet and Dirt edition include 2 complete sets of springs chosen for their intended track conditions.

The XB4 springs, like all other XRAY springs, are manually measured, selected, and matched into pairs to guarantee precisely equal length and damping characteristics.

Each spring is laser-engraved with stripes to clearly indicate its firmness.

Shock Towers.

Both front & rear shock towers compliment the new big bore shocks and suspension changes on the new XB4.

The front tower is wider to increase the set-up options for all different track conditions.

Lowered shock mounting positions on the rear tower allow for a softer set-up to generate more traction but with less roll.

Front & rear shock towers are machined from premium-grade graphite that is lightweight & strong, with multiple shock and roll center adjustment positions.

The shock towers are universal for both Dirt and Carpet edition.

Shock Towers.

Redesigned shock towers compliment the new big bore shocks. The front tower is wider to increase the set-up options for all different track conditions. The new rear tower lowers the shock positions for reducing chassis roll.

Both front & rear shock towers compliment the new big bore shocks and suspension changes on the new XB4.

The front tower is wider to increase the set-up options for all different track conditions.

Lowered shock mounting positions on the rear tower allow for a softer set-up to generate more traction but with less roll.

Front & rear shock towers are machined from premium-grade graphite that is lightweight & strong, with multiple shock and roll center adjustment positions.

The shock towers are universal for both Dirt and Carpet edition.

Wing.

A new rear wing is included in both Carpet & Dirt editions. The new “Lush” rear wing has more downforce & less drag to improve overall performance. The new wing generates more traction but maintains easy jumping characteristics. The wing has pre-marked mounting holes and a new design that significantly increases lifespan.

Made from strong Lexan™ material, the wing is supported on the wing mounts by extended flat shims to better support and extend the life of the wing.

Wing.

A new rear wing generates more traction, provides better jump stability, and significantly increases lifespan. The wing features pre-marked mounting holes for easy installation and is included in both Carpet & Dirt Edition.

A new rear wing is included in both Carpet & Dirt editions. The new “Lush” rear wing has more downforce & less drag to improve overall performance. The new wing generates more traction but maintains easy jumping characteristics. The wing has pre-marked mounting holes and a new design that significantly increases lifespan.

Made from strong Lexan™ material, the wing is supported on the wing mounts by extended flat shims to better support and extend the life of the wing.

Motor Cooling.

The optional cooling fan is mounted via a specially designed composite holder that is mounted only through one screw and a centering pin to minimize vibrations and increases fan lifespan.

Motor Cooling.

The optional cooling fan is mounted via a specially designed composite holder that is mounted only through one screw and a centering pin to minimize vibrations and increases fan lifespan.

Some information shown below may include details from previous kits, and it may vary slightly from current kit specifications.

Chassis Layout.

Chassis layout offers the ability to place the motor and central assembly in a front or rear position to alter the weight balance depending on the track conditions.  The chassis layout was tested on all kind of surfaces to increase performance in any track situation.

Chassis Layout.

Chassis layout offers the ability to place the motor and central assembly in a front or rear position to alter the weight balance depending on the track conditions.  The chassis layout was tested on all kind of surfaces to increase performance in any track situation.

Motor Bulkhead.

Narrow motor bulkhead positions the motor towards the chassis centerline for proper weight balance. The lower design of the motor mount also reduces the CG for better controlled chassis roll.

Motor Bulkhead.

Narrow motor bulkhead positions the motor towards the chassis centerline for proper weight balance. The lower design of the motor mount also reduces the CG for better controlled chassis roll.

Motor Mount.

Matching the motor bulkhead, the motor mount plate is small and light to reduce weight yet still offer the necessary adjustment range for motor installation. 

The motor mounting plate features a shape for easy access to the pinion gear set screw. The inner motor screw is recessed into the mount for improved clearance around the center spur gear.

The motor is connected to an eccentric mounting plate, with the assembly then inserted into an integrated motor holder/drivetrain support. The design allows quick & easy motor rotation to adjust gear mesh, and still securely holds the motor plate using only a single screw.

To ensure the motor will not loosen in a serious crash or due to insufficient tightening, the motor plate has a bayonet mounting system which prevents it from being dislodged from the motor holder. By rotating the motor mount plate to the opposite direction, the motor can be quickly removed from the vehicle.

Removing the motor or adjusting the gear mesh is easy and fast.

Motor Mount.

Matching the motor bulkhead, the motor mount plate is small and light to reduce weight yet still offer the necessary adjustment range for motor installation. 

Matching the motor bulkhead, the motor mount plate is small and light to reduce weight yet still offer the necessary adjustment range for motor installation. 

The motor mounting plate features a shape for easy access to the pinion gear set screw. The inner motor screw is recessed into the mount for improved clearance around the center spur gear.

The motor is connected to an eccentric mounting plate, with the assembly then inserted into an integrated motor holder/drivetrain support. The design allows quick & easy motor rotation to adjust gear mesh, and still securely holds the motor plate using only a single screw.

To ensure the motor will not loosen in a serious crash or due to insufficient tightening, the motor plate has a bayonet mounting system which prevents it from being dislodged from the motor holder. By rotating the motor mount plate to the opposite direction, the motor can be quickly removed from the vehicle.

Removing the motor or adjusting the gear mesh is easy and fast.

High Traction Body.

The XB4 Carpet and Dirt Editions each feature XRAY Delta bodies with narrower front and rear sections matching the chassis & side guards.

XRAY Delta bodies feature super-smooth airflow and appropriate downforce characteristics fine-tuned for their intended conditions.

The Carpet Edition of the Delta body is designed especially for high traction conditions and improves the stability in the fast corners, chicanes and improves rotation in tight corners.

The Delta Carpet body is also available in lightweight version.

High Traction Body.

The XB4 Carpet and Dirt Editions each feature XRAY Delta bodies with narrower front and rear sections matching the chassis & side guards.

XRAY Delta bodies feature super-smooth airflow and appropriate downforce characteristics fine-tuned for their intended conditions.

The Carpet Edition of the Delta body is designed especially for high traction conditions and improves the stability in the fast corners, chicanes and improves rotation in tight corners.

The Delta Carpet body is also available in lightweight version.

Low Traction Body.

The Dirt Edition Delta body incorporates the same narrowed front & rear sections that follow the shape of the chassis & side guards.

The Dirt edition of the XRAY XB4 Delta body is designed for low traction conditions. The design improves the stability and increases traction.

The Delta Dirt body is also available in lightweight version.

Low Traction Body.

The Dirt Edition Delta body incorporates the same narrowed front & rear sections that follow the shape of the chassis & side guards.

The Dirt edition of the XRAY XB4 Delta body is designed for low traction conditions. The design improves the stability and increases traction.

The Delta Dirt body is also available in lightweight version.

Chassis Brace.

The front chassis T-Brace in Carpet edition increases front stability on high traction tracks and makes the car more predictable and easier to drive. The shorter graphite brace in Dirt edition is more flex to increase traction on low traction surfaces.

The rear graphite chassis brace is installed over the lower composite brace connected directly to the chassis. The graphite brace reinforces the rear of the car and generates more stability by increasing traction.

The chassis braces are a vital part of the Multi-Flex™ adjustability.

Chassis Brace.

The front chassis T-Brace in Carpet edition increases front stability on high traction tracks and makes the car more predictable and easier to drive. The shorter graphite brace in Dirt edition is more flex to increase traction on low traction surfaces.

The front chassis T-Brace in Carpet edition increases front stability on high traction tracks and makes the car more predictable and easier to drive. The shorter graphite brace in Dirt edition is more flex to increase traction on low traction surfaces.

The rear graphite chassis brace is installed over the lower composite brace connected directly to the chassis. The graphite brace reinforces the rear of the car and generates more stability by increasing traction.

The chassis braces are a vital part of the Multi-Flex™ adjustability.

Slipper One-way Clutch 2-in-1.

Unique Multi-Adjustable Slipper One-way Clutch features 2-in-1 functionality with the adjustable central slipper clutch and an adjustable front One-way Slipper to lock-in the front end under acceleration and to adjust slipper off-power handling which influences how easy the car is on landing and under high-speed braking as well prevents traction roll at corner entry.

The Multi-Adjustable Slipper One-way Clutch pushes the carpet track performance of the XB4 to a whole new level. The clutch features 2-in-1 configuration that combines an adjustable central slipper clutch with a separately adjustable front one-way slipper.

The primary Multi-Adjustable Slipper with 2 pads controls the on-power handling of the car with a range from smooth up to aggressive acceleration.

The front one-way slipper features a separate slipper pad to control the one-way output to the front driveline. The smart design uses the one-way bearing lock-up under acceleration along with the main slipper setting to control power delivery like a traditional slipper for maximum traction and acceleration. Off-power, the one-way slipper setting controls the aggressiveness of high speed braking and how the car reacts on jump landings. With the front one-way slipper, the car dives less under heavy braking to improve corner entry without risking traction rolls. The one-way slipper also makes the XB4 more forgiving in sideways landings when trying to line up for a corner immediately after a jump.

Slipper One-way Clutch 2-in-1.

Unique Multi-Adjustable Slipper One-way Clutch features 2-in-1 functionality with the adjustable central slipper clutch and an adjustable front One-way Slipper to lock-in the front end under acceleration and to adjust slipper off-power handling which influences how easy the car is on landing and under high-speed braking as well prevents traction roll at corner entry.

Unique Multi-Adjustable Slipper One-way Clutch features 2-in-1 functionality with the adjustable central slipper clutch and an adjustable front One-way Slipper to lock-in the front end under acceleration and to adjust slipper off-power handling which influences how easy the car is on landing and under high-speed braking as well prevents traction roll at corner entry.

The Multi-Adjustable Slipper One-way Clutch pushes the carpet track performance of the XB4 to a whole new level. The clutch features 2-in-1 configuration that combines an adjustable central slipper clutch with a separately adjustable front one-way slipper.

The primary Multi-Adjustable Slipper with 2 pads controls the on-power handling of the car with a range from smooth up to aggressive acceleration.

The front one-way slipper features a separate slipper pad to control the one-way output to the front driveline. The smart design uses the one-way bearing lock-up under acceleration along with the main slipper setting to control power delivery like a traditional slipper for maximum traction and acceleration. Off-power, the one-way slipper setting controls the aggressiveness of high speed braking and how the car reacts on jump landings. With the front one-way slipper, the car dives less under heavy braking to improve corner entry without risking traction rolls. The one-way slipper also makes the XB4 more forgiving in sideways landings when trying to line up for a corner immediately after a jump.

Central Gear Differential.

The central differential is included in the Dirt Edition. The gear diff shares the same universal diff case and internal parts found in the front/rear differentials.

The maintenance-free, super-smooth gear diff has greater internal oil volume to increase consistency of the diff action and includes a composite case and cover with internal satellite gears that are precision-molded from special XRAY-developed graphite composite material, ensuring a long lifespan and super-smooth, efficient operation.

The differential outdrives are designed for use with 2.5mm driveshaft pins. The gear diff set includes an 81T spur gear and a 78T spur gear is available as an option.

The central differential is recommended for use on clay, bumpy Astro and low-traction tracks to increase traction.

Central Dogbone Drive Shafts.

The central drivetrain features outdrives and dogbone driveshafts with longer lifespan and easier maintenance than previous CVD drive shafts. To accommodate chassis flex but to eliminate any excess play, O-rings are inserted inside the outdrives to support the driveshafts and to prevent damage from high impacts.

The rear center drive shaft is the same length for both Carpet and Dirt version. The front drive shaft for the Carpet edition is shorter due to the increased length of the One-Way Slipper assembly compared to the gear differential found in the Dirt edition.

Drive shafts are manufactured from world-renowned HUDY Spring Steel™ and feature 2.5mm drive pins for maximum drivetrain efficiency. The drive shafts are some of the world‘s thinnest yet most durable drive shafts used in electric off-road cars. Hardened with a proprietary hardening process, the drive shafts provide unbeatable lifespan and reliability.

Central Dogbone Drive Shafts.

The central drivetrain features outdrives and dogbone driveshafts that offer reduced maintenance compared to previous CVD drive shafts.

The central drivetrain features outdrives and dogbone driveshafts with longer lifespan and easier maintenance than previous CVD drive shafts. To accommodate chassis flex but to eliminate any excess play, O-rings are inserted inside the outdrives to support the driveshafts and to prevent damage from high impacts.

The rear center drive shaft is the same length for both Carpet and Dirt version. The front drive shaft for the Carpet edition is shorter due to the increased length of the One-Way Slipper assembly compared to the gear differential found in the Dirt edition.

Drive shafts are manufactured from world-renowned HUDY Spring Steel™ and feature 2.5mm drive pins for maximum drivetrain efficiency. The drive shafts are some of the world‘s thinnest yet most durable drive shafts used in electric off-road cars. Hardened with a proprietary hardening process, the drive shafts provide unbeatable lifespan and reliability.

Central Bulkhead.

To match the dimensions of the one-way slipper, the aluminum central bulkhead and graphite top deck were redesigned for the Carpet edition.

Central Bulkhead.

To match the dimensions of the one-way slipper, the aluminum central bulkhead and graphite top deck were redesigned for the Carpet edition.

Servo Mount.

The servo mount fits the frontward chassis layout and features two aluminum stands with a graphite stiffener from top.

Servo Mount.

The servo mount fits the frontward chassis layout and features two aluminum stands with a graphite stiffener from top.

Electronics Plate.

A handy, compact electronics plate for speed control mounting provides quick & easy removal and assembly. Redesigned to fit the chassis layout and side guards, the plate is now mounted directly to the chassis instead of the side guards to reduce the impact on chassis flex characteristics.

Electronics Plate.

A handy, compact electronics plate for speed control mounting provides quick & easy removal and assembly. Redesigned to fit the chassis layout and side guards, the plate is now mounted directly to the chassis instead of the side guards to reduce the impact on chassis flex characteristics.

Bulkheads.

Front & rear bulkheads feature a horizontal split design (HS) to retain easy diff access while adding the valuable diff height adjustment. The unique design of the bulkheads uses an inline bushing to alter the alignment and height of the bevel drive gear. In addition to accommodating the diff height adjustments, it also allows the front central driveshaft to operate with a reduced angle for less friction and wear on the CV joint components and improved driveline efficiency.

The XB4 bulkheads allow fast and easy differential access for setup changes or servicing by removing only 4 screws from the upper gear box cover while the lower section remains mounted to the chassis. This super-fast diff access is featured on both front and rear gearboxes.

The super-strong, narrow bulkheads provide the needed clearance for the redesigned suspension holders with increased set-up range possibilities.

Diff Height Adjustment.

Front & rear HS bulkheads allow for diff height adjustment using eccentric bushings. In the front gearbox, the diff height has 3 different settings. The rear differential can be adjusted through a 5mm range. The diff height adjustment is a vital set-up capability that allows quick set-up adaption for either Carpet or Dirt tracks.

Carpet edition uses a lower ride height and the upper differential position to keep the drive shafts level.

Dirt edition typically uses a taller ride height and a lower differential position to keep the drive shafts level.

Diff Height Adjustment.

Central Drive Train.

The design of the HS bulkhead with the inline bushing for the bevel drive gear creates a more linear orientation for the front center drive shaft to reduce the CV joint angle for increased driveline efficiency and decreased friction and wear.  The height and angle of the rear center drive shaft is also adjustable depending on the height adjustment of the differential.

Front - there are 3 different angle configurations for adjustment of the front drive train.

Rear - there are 6 different height configurations for adjustment of the rear drive train.

Diff Gears.

The shorter pinion gear allows the drive shafts to move the CV joint closer to the differential to improve drive train efficiency.

Both crown gear and pinion gear are CNC-machined from HUDY Spring Steel and are ultra-hardened making them very strong and reliable with a longer life span. The split crown gear allows for a simpler exchange to optional gears without requiring a rebuild of the internal diff assembly and results in significantly lower rotating mass and improves the serviceability.

To improve the gear engagement both crown gear and pinion gear have more teeth and geometry that results in smoother engagement and increased efficiency.

I.S.S.™ Suspension Holders.

The rear suspension holders can be installed in upward or downward orientations, resulting in additional roll center locations for the inner hinge pins.

The downward orientation of the suspension holder is used primarily for Dirt tracks.

The upward orientation of the suspension holder is used primarily for Carpet tracks.

The suspension holders allow use of both the long or standard suspension arm configurations.

Machined from premium Swiss 7075 T6 aluminum and black coated.

Battery Holder.

Tweak-free Quick Battery Holder allows for easy retainer height adjustment for more convenient battery mounting. The entire system is intended to reduce the effects of the battery and holder on chassis flex, making the XB4 more predictable and easier to drive.

The battery holder is universal for both Dirt and Carpet edition.

Body Posts.

Rear body mount feature more frontward position and fit the rear Horizontal Split Bulkhead (HS) and the latest body. The shape of the holder allows for super easy access to the screws on the upper part of the bulkhead. Machined from premium graphite material.

Beefy 6mm thick body posts are made from a special composite material for maximum strength. The body supports are rounded to have a better fit and provide better support for the car body.

Steering System.

The dual arm steering system is simple yet effective, and features an easily adjustable integrated servo saver. Ackermann is easily adjusted by quickly changing the steering link mounting positions on the steering plate.

Bump steer is adjusted for more aggression by inserting a shim between the steering block and steering linkage.

Anti-roll Bars.

Both Carpet and Dirt edition include anti-roll bars selected for their specific track conditions.

Anti-roll bars are manufactured from special spring steel material and are used to stabilize the front & rear ends of the car. The roll bars are easily mounted to the diff cases and can be adjusted with the linkages.

Front & rear anti-roll bars are interchangeable since they have same design and shape. The thickness of each anti-roll bar is laser-engraved for easy identification. Anti-roll bar wires of different thickness are available separately for fine-tuning.

Anti-roll Bars.

Both Carpet and Dirt edition include anti-roll bars selected for their specific track conditions.

Anti-roll bars are manufactured from special spring steel material and are used to stabilize the front & rear ends of the car. The roll bars are easily mounted to the diff cases and can be adjusted with the linkages.

Front & rear anti-roll bars are interchangeable since they have same design and shape. The thickness of each anti-roll bar is laser-engraved for easy identification. Anti-roll bar wires of different thickness are available separately for fine-tuning.

Wheels.

The included wheels are IFMAR standardized with the wheel hex offset. The wheels feature a redesigned countersunk center area to allow the wheel nut to sit deeper in the wheel.

The wheels are perfect for high-competition racing. They feature internal reinforcement ribs to provide stability and resist deformation, yet they are made from a flexible material to provide durability and withstand impacts.

The side of the wheel is aerodynamic for maximum performance. The wheels were designed to provide maximum traction.

The wheels feature a 12mm internal hex.

XRAY Instruction Manual.

The Instruction manual is universal for both Carpet and Dirt edition and features a list of any important optional parts suggested for fine set-up adjustments.

XRAY Instruction Manuals have become the industry standard, being simply the best manuals you will ever get with an RC model car. Whether you are a first-time builder or an experienced racer, all the instructions are straight-forward and easy to understand. The full-color instruction manual contains large 3D illustrations that show all assembly details in the clearest possible way.

XRAY Instruction Manual.

The Instruction manual is universal for both Carpet and Dirt edition and features a list of any important optional parts suggested for fine set-up adjustments.

XRAY Instruction Manuals have become the industry standard, being simply the best manuals you will ever get with an RC model car. Whether you are a first-time builder or an experienced racer, all the instructions are straight-forward and easy to understand. The full-color instruction manual contains large 3D illustrations that show all assembly details in the clearest possible way.

Commitment.

“Being part of the R&D team, I know how much time, energy, and effort is put into developing all of our cars. Chasing perfection is a never-ending process, and as such we strive to bring you an improved & better-handling XB4. You will be amazed by the handling & reliability improvements of the new XB4, which will help bring you to the Winners’ Circle.”

Martin Bayer
XRAY Factory Team driver
European Champion

Designing & Making of XB4.

Read the exclusive story about the designing and making of the XRAY XB4.

Spur Gear.

Precision-molded spur gears are made from XRAY's exclusive secret blend of composite material, allowing the gear to run true yet be robust enough to handle high-performance brushless motors. The spur gears are designed to have the lowest possible weight while staying strong and light. Each gear is stamped with the tooth number for easy identification.

The XB4 is equipped with an 81T spur gear which suits the majority of tracks. For additional tuning, optional 72T, 75T, 78T, 84T and 87T spur gears are available.

Suspension.

The correct suspension geometry is one of the most important features of any RC model car, while at the same time being one of the most difficult and challenging features for a designer.

 

The suspension is always a mixture of:

• design and shape of individual suspension parts

• flex and hardness

• materials used

• mounting system

• geometry and position of mounting points of connecting parts

 

From the suspension arms, through the suspension blocks, to the light yet robust steering blocks, every suspension part has been specially designed for the 1/10 off-road racing platform to provide responsive racing characteristics in all conditions. 

Wheelbase Adjustment.

Suspension arms allow for quick & easy wheelbase adjustment. Using included 2mm shims, both front and rear suspension arms can be moved either forward or rearward to adjust weight balance depending on track conditions.

By moving the arms to the front, the balance and weight of the car are transferred more to the rear; this is recommended for medium- and high-traction conditions.

By moving the arms to the rear, the balance and weight of the car are transferred more to the front.

Drive Shafts.

The front and rear driveshaft lengths are updated to match the new differential width and suspension geometry; the front drive shaft is 83mm long and the rear drive shaft is 75mm long.

The safety collar on the front driveshaft secures the pin, while the ball bearing captures the pin in rear axles, both preventing the pin from coming lose during a run.

XB4 constant velocity drive shafts are manufactured from world-renowned HUDY Spring Steel™ and feature 2.5mm drive pins for maximum drivetrain efficiency. The drive shafts are some of the world‘s thinnest yet most durable drive shafts used in electric off-road cars. Hardened with a proprietary hardening process, the drive shafts provide unbeatable lifespan and reliability.

Ball-bearings.

All-new larger ball-bearing used in the rear uprights for increased reliability. The XB4 features greased ball-bearings for front steering blocks & rear uprights to increase lifespan in dusty conditions. The remaining bearings are degreased and oiled with AeroShell® Fluid 12 for maximum smoothness and long life.

A full set of high-speed ball-bearings are used throughout the drivetrain to ensure maximum efficiency.

Turnbuckles.

To guarantee maximum reliability, all turnbuckles are manufactured from special HUDY Spring Steel™ material for turnbuckles which features a tougher core. These turnbuckles are used for front & rear upright linkages, steering system, and also for the servo saver.

Silicone Oils.

HUDY Exclusive Silicone Oils are manufactured in Europe and each batch is laboratory tested and calibrated to ensure the highest possible consistency and quality from batch to batch. Based on the industry-standard cSt rating, the new line of oils will be easy to identify, adjust, and feel.

When following any set-up sheets by XRAY or XRAY team drivers, you can be sure that the oils you will get for your car are exactly same as those used by the factory racing team, thus ensuring very exacting set-ups and handling.

HUDY Chem Series.

Silicone Oils.

HUDY Exclusive Silicone Oils are manufactured in Europe and each batch is laboratory tested and calibrated to ensure the highest possible consistency and quality from batch to batch. Based on the industry-standard cSt rating, the new line of oils will be easy to identify, adjust, and feel.

When following any set-up sheets by XRAY or XRAY team drivers, you can be sure that the oils you will get for your car are exactly same as those used by the factory racing team, thus ensuring very exacting set-ups and handling.

HUDY Chem Series.

Wheel Hubs.

Ultra-lightweight 12mm wheel hex drive hubs are CNC-machined from Swiss 7075 T6 black-coated aluminum. These ultra-true hex hubs have a clamping design which ensures ultra- solid mounting of the wheel on the hub.

The rear alu hex hubs are specially machined to reduce rotating weight while guaranteeing wobble-free wheel mounting.

To adjust track-width, optional offset wheel hex drive hubs are available.

Body Seal.

To improve protection against dust, Velcro® double-sided tape is included to ensure a perfect seal of the body to the side guards, to reduce the noise level of the running car.

Chassis Balance.

The chassis design focuses on balanced weight distribution and weight transfer. The chassis features pre-drilled holes for additional weights for optimum car balancing. Centerline holes are pre-drilled for easy balancing with the HUDY Chassis Balancing Tool #107880.

Adjustment Possibilities.

The extensive and impressive range of adjustment possibilities includes: caster, camber, toe, kick-up, anti-squat, ride height, downstops, track-width, lower roll center, upper roll center, roll center positions, bump steer, wheelbase, Ackermann, adjustable shocks, adjustable front and rear diff and adjustable XRAY Multi-Flex™.

Set-up Book.

The XB4 is one of the most adjustable electric off-road car in the world. Whether you are a hardcore racing fanatic or a club-level sportsman, you can very easily adjust the XB4 to suit your racing style, race track type, and all track conditions. To fully understand the set-up possibilities we recommend the legendary HUDY Set-up Book, loaded with over 40 pages of high-quality pictures and easy-to-understand RC car set-up explanations. Whether you are a novice driver or experienced racer, you can easily learn many set-up tips & tricks and improve your set-up skills, ultimately translating into improved racing performance with your XB4. The HUDY Set-up Book is available for download exclusively at www.hudy.net

XRAY VIP Customer Treatment.

Owning an XRAY model racing car is an experience on its own. Not only will you own the most premium luxury model racing car in the world, but you will also become a member of the prestigious family of XRAY owners with direct support and service from the XRAY factory. XRAY brings you the most up-to-date RC Web site on the Internet, with daily racing news and latest product developments. If you have any questions, problems or comments, you can ask the XRAY Support Team or any XRAY Factory Team Driver on the XRAY Support Forum. You can even upload your own set-up sheets or download from the thousands of different set-up sheets available from all around the world at the exclusive XRAY Virtual Set-up Sheet Database, the world’s largest set-up sheet database. And that is only the start of the VIP treatment you get by joining Team XRAY.

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