 TRX® 2.5 Racing Engine
"The TRX 2.5 blows away every other small block engine we've ever tested!" -- RC Nitro Magazine
“Best Nitro Engine” -- RC Car Action Magazine Readers’ Choice Award
The high-revving TRX 2.5 Racing Engine is a perfect match for the efficient, low- mass drivetrain in the S-Maxx®. The two-needle composite slide carburetor, trick porting, and free-flowing rear exhaust deliver unmatched, class-leading horsepower that pushes S-Maxx past 40mph! Plus only the TRX 2.5 has the push-button starting convenience of the EZ-Start on-board Electric Starting System.
 High-Volume Air Intake System
The TRX 2.5 Racing Engine uses a high-volume air intake system with a two-stage air filter. The filter housing and neck are designed to mate seamlessly with the carburetor to eliminate turbulence in the air-flow going into the engine.
 Tuned Exhaust System
Call it a factory "works" pipe. The header, pipe length, and shape are dyno-tuned for the TRX 2.5 to bring out the most power over the broadest RPM range.
 EZ-Start® Electric Starting System
The Traxxas EZ-Start consists of an onboard drive unit that lights the glow plug and spins the engine for easy push-button starting from the handheld control module. The controller contains diagnostic LEDs that provide real-time status of the glow plug and starter motor. It tells you if the glow plug is bad and protects the starter motor from overloading. The EZ-Start system is powered by a standard rechargeable 7.2 volt battery pack. The EZ-Start is the only one that offers the convenience of true one-handed, one-button operation.
 New on S-Maxx!
S-Maxx now includes high-contrast gray parts including strengthened bulkheads, lower chassis braces, skid plates, an updated receiver box with blue-anodized aluminum crimp nut, and Ultra Shock™ shock bodies.
In addition, S-Maxx incorporates a refined differential housing, Revo®-style shock towers with stronger body mounting posts, pre-glued SportTraxx™ tires on lightweight racing wheels. Thoughtful integration of gray molded parts provides a fresh, updated look to the chassis.
 Gray Battery and Receiver Boxes
The batteries, on/off switch, and the receiver are placed inside of molded, dirt-resistant boxes (with gaskets) to protect them from water, debris, and damage.
 Oil-Filled Ultra Shocks™
Traxxas oil-filled Ultra Shocks are fully tuneable for race-inspired performance. The spring pre-load is adjustable via precise clip-on spacers making it easy to know that each shock is adjusted to the same spec. Rubber pressure bladders prevent air pockets and foaming common with bladderless designs. Double o-ring seals in the shock body prevent leaking.
 SportTraxx™ Tires
S-Maxx includes lightweight, 3.2" SportTraxx tires for Ready-To-Race® performance on the track. They feature a super soft rubber compound with a directional and asymmetrical tread pattern. The high tech foam inserts combined with the aggressive, multi-angled tread pattern make for optimum traction and handling.
 Painted ProGraphix® Body
Traxxas pioneered and perfected the art of applying incredible pre-painted graphics to Lexan R/C truck bodies. It could take hours (if not days) of work and many dollars in paint and supplies to try and duplicate the colorful, detailed graphics that come on the S--Maxx body, right out of the box.
 Forward Only Two-Speed Transmission
S-Maxx's fully enclosed transmission features two-speeds for race-truck acceleration in low gear and 40+mph top speeds in high gear. Shifting is hard, fast, and automatic with an adjustable shift point! Since the transmission is forward-only, it provides constant drive engagement for locked-in, responsive acceleration.
 Adjustable Slipper Clutch
S-Maxx is equipped with an adjustable slipper clutch to absorb drivetrain shocks and protect against damage. Standard spur gears are used to allow easy changes to the overall gearing.
 Disc Brake
S-Maxx uses a disc brake mounted forward of the transmission to provide powerful braking action and sure-footed stopping power. A fiberglass-composite disc and stainless steel pads are used for long life and reliability.
 U-Joint Slider Driveshafts
The large diameter slider driveshafts are made to take abuse. With real U-joints at each end and variable-length sliding half shafts, our driveshafts allow longer suspension travel, no binding, and less friction than metal "dog-bone" shafts. The Traxxas driveshaft material absorbs impacts and stress loads that break skinny metal drive shafts. It's a superior, better-engineered solution.
 Hardened-Steel Differentials
Hardened-steel ring and pinion gears have been precisely engineered to deliver quiet, efficient operation and reliable performance. The integrated gear differentials also use hardened steel gears for tough, virtually maintenance-free running. They’re made to take the rigorous workouts that are sure to come when S-Maxx hits the track.
 High-Torque Steering Servo
A big truck needs a powerful steering servo for responsive performance. The included Traxxas high-torque servo delivers over 80 in/oz of torque.
 Bellcrank Steering System
The bellcrank steering system provides precise steering geometry for correct Ackerman and almost no bump steer, even with S-Maxx's huge suspension travel. The supplied bellcrank bushings can be replaced with ball-bearings for even smoother steering performance.
 That Famous Maxx® Suspension
One of the hallmarks of the S-Maxx is its incredible WideMaxx 4-wheel independent suspension. Wicked long travel, nearly 4 inches at each wheel, is ready to take on just about the roughest terrain you can imagine. Eight oil-filled shocks (2 at each wheel) are specially positioned and tuned to provide a lower, firmer stance for more stability and precise handling. The WideMaxx suspension is fully tuneable for the track with up to 10 shock-mounting positions, adjustable front caster angle, front and rear toe, and front and rear camber angles.
 Rubber Sealed Ball Bearings
Nothing less than the precision of smooth-running, rubber-sealed ball bearings is good enough for S-Maxx. Faster performance, less maintenance, and no need to plan for a costly upgrade are just a few of the benefits.
 6061-T6 Aluminum Chassis
The 3mm aluminum chassis is stamped from durable 6061-T6 aluminum and then anodized in beautiful blue. Besides forming a rigid backbone for the rest of the truck, the aluminum acts like a heat sink to draw additional heat away from the engine. All of the systems and components are neatly arranged on the chassis for easy cleaning and servicing.
 Heavy-Duty Nylon Construction
The S-Maxx isn't just made of plastic. Its parts are molded from various types of composite-filled nylon that strike the perfect balance of rigidity and resistance to breakage. Traxxas has been perfecting the formula for years! We can't promise that you’ll never, ever break something, but you can count on the S-Maxx for superior durability and you'll be amazed at the kinds of crashes and daredevil stunts it can withstand.
 Three-Channel Radio System
S-Maxx includes the TQ-3 pistol grip radio system. The TQ-3 delivers up to a quarter-mile range, electronic trim controls, low-battery indicator, servo-reversing, and the exclusive grip-mounted shifter. The third channel is built in if you want to add reverse later.
We offer the best support, period. Nobody works harder than Traxxas to be accessible to you. We have friendly toll-free phone support that’s available from 8:30am to 9pm central time weekdays. Just call 1-888-TRAXXAS. We also offer e-mail support anytime at support@Traxxas.com. Parts and service are available from a network of almost 2,000 hobby dealers worldwide. Traxxas models are about experiencing total performance and satisfaction, not just in the products, but also with the company that stands behind them.
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