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.

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.

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.

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.

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.

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.

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 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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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

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.

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.

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.

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.