The XT4 is a premium, professional, high-competition 1/10 electric truggy for the most demanding racers, developed with attention to detail and backed by premium service.

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 XT4’25.

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.

Significantly reinforced front & rear suspension arms are much stronger and more reliable, reducing the chances of failure during a crash.

The suspension arms are rigid enough to provide a responsive feel; yet soft enough for extreme durability. The exclusive composite mixtures used for suspension arms are a perfect balance between reliability and performance.

There are three different rear suspension arms available: medium (included), hard (option) and graphite (optional), each suitable for particular track conditions.

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 features diff-outdrives designed for use with 2.5mm pin.

To improve the reliability and strength, the steering blocks are molded from a medium hardness composite mixture that is suitable for most track conditions. The new medium compound significantly improves the reliability to enable finishing a race after significant crashes or impacts.

There are three different steering blocks available – medium (included), hard (option) and graphite (option) – which can be used to fine tune steering response for various track conditions.

The tiny yet tough steering blocks are molded from a special composite mixture for maximum strength.

Composite steering block inserts allow for very quick & easy lower roll center adjustment. With additional shims and extra inserts, fine tuning the roll center is easily achieved.

For maximum drivetrain reliability, larger 5x12 ball-bearings are used in the outer position with increased dynamic load. On the inner position, the smaller 5x10 ball-bearings are used for minimized unsprung weight.

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.

The XT4 includes two rear uprights with different roll center positions. The lowered roll center uprights are suggested for Astro and high roll center uprights are suggested for dirt conditions.

The additional rear uprights feature roll center positions that improve stability by resisting suspension collapse in high-speed corners. The kit includes both lower & higher roll center uprights in the kit for expanded tuning option right out of the box.

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 pivot mounts with an updated roll center position.

The upper roll center position is adjusted via shims when attaching the alum pivot mount to the upright (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 four different uprights available: medium (included), hard (optional), 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.

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.

Redesigned XT4 body features pre-marked body post positions for both previous and new XT4 version.

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.

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 high performance low profile aerodynamic body was designed by XRAY to perfectly fit the XT4 and to work in most track conditions effectively.

The front and rear of the body have been designed to provide downforce for maximum stability of the truggy. The body sides as well the cockpit sides are as flat as possible to allow the air flow around the body for the side stability. On the top of roof two flow channels are incorporated for proper air flow.

The wing & body are made from high quality premium Lexan material.

Optional thicker rear wing #323523 is highly reliable with less chance of breakage, while at the same time influencing the performance of the truggy. The thicker wing gives higher traction and stability but can reduce steering.

The 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 XT4 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 expanded set-up possibilities.

The chassis layout moves the center diff, motor and battery significantly forwards and increases stability, allowing for more aggressive landings and making the truggy more forgiving.

The chassis layout was tested on all kind of surfaces to increase performance in every track situation. The center drive train and battery were significantly moved forwards compared to previous layouts.

Moving the weight balance to the front increases the stability and predictability on the track. Now the XT4 can be driven much harder and is more forgiving, which results in fewer mistakes and faster lap times.

The optional front chassis t-brace increases front stability on high traction tracks, making the XT4 more predictable and easier to drive. The rear graphite chassis brace is installed over the lower composite brace connected directly to the chassis. The graphite brace reinforces the rear chassis structure and provides more stability and traction as well.

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

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

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 vehicles. Treated with a proprietary hardening process, the drive shafts provide unbeatable lifespan and reliability.

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

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 vehicles. Treated with a proprietary hardening process, the drive shafts provide unbeatable lifespan and reliability.

A handy, compact electronics plate for speed control mounting provides quick & easy removal and assembly. Redesigned to fit the new 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.

The front & rear suspension holders accommodate the HS bulkheads and offer an expanded range of set-up adjustments.

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.

Machined from premium Swiss 7075 T6 aluminum and black coated.

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.

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.