Traxxas Steel Motor Shaft Spacer with E-Clip Retainer TRX7878X

Overview

The Traxxas Spacer, motor shaft (steel)/ e-clip (1) TRX7878X is an essential drivetrain spare part designed for Traxxas RC vehicles, particularly the X-Monster chassis. This precision-engineered component is a critical element of your RC car's motor assembly, ensuring optimal power transmission and mechanical reliability during high-performance running. Whether you're a seasoned RC enthusiast maintaining your collection or a dedicated basher pushing your vehicle to the limit, having quality replacement parts on hand is essential for keeping your RC monster truck or buggy running smoothly. This steel motor shaft spacer, complete with e-clip, provides the durability and precision fit that Traxxas vehicles demand.

At RC Model Shop, we understand that RC cars UK enthusiasts need access to genuine, quality spare parts that match original equipment specifications. The TRX7878X is an OEM Traxxas component that maintains the exact tolerances and material quality required for proper motor function. Steel construction delivers superior wear resistance compared to plastic alternatives, ensuring that your motor assembly remains perfectly aligned and mechanically sound through countless hours of racing, freestyle stunting, and off-road bashing. This single spacer unit, paired with the included e-clip retaining ring, represents the kind of precision engineering that Traxxas is renowned for throughout the ready to run RC community.

For those running high-performance brushless RC setups or maintaining classic brushed motor vehicles, this spacer plays a vital role in the drivetrain assembly. When your existing spacer shows wear, becomes damaged, or is simply lost during maintenance, the TRX7878X provides an authentic replacement that restores your vehicle to factory specifications. Stock this spare part in your RC toolbox and enjoy the peace of mind that comes from knowing you can quickly restore your vehicle to peak performance without hunting for compatible alternatives.

Key Features

• Genuine Traxxas OEM Component — This is an authentic factory spare part manufactured by Traxxas to exact specifications, ensuring perfect compatibility and reliability with your Traxxas RC vehicles without compromise or fitment issues.
• Steel Construction — The spacer is manufactured from premium steel material that delivers exceptional durability, wear resistance, and long service life under the demanding conditions of competitive racing and aggressive bashing.
• Precision Engineering — Manufactured to exacting Traxxas tolerances, this spacer ensures perfect alignment of your motor shaft, maintaining optimal power transmission efficiency and preventing mechanical play that could compromise performance.
• Includes E-Clip Retainer — The package includes one e-clip (also called a snap ring), which is the critical component that locks the spacer firmly in place on the motor shaft and prevents unwanted movement during operation.
• Drivetrain Specific Design — This component is specifically engineered for drivetrain applications within Traxxas RC vehicles, optimised for the forces and stresses encountered during acceleration, cornering, and high-speed running.
• Direct Replacement Part — Designed as a direct replacement for worn or damaged original spacers, requiring no modification or additional components for installation on compatible Traxxas chassis.
• Compact and Lightweight — The spacer's minimal weight contribution ensures it does not impact your vehicle's weight distribution or handling characteristics while providing essential mechanical function.

Technical Performance

The TRX7878X motor shaft spacer represents Traxxas's commitment to quality component engineering in the RC car drivetrain. Steel material selection provides superior performance characteristics compared to composite or aluminium alternatives, offering exceptional rigidity that maintains precise motor shaft alignment even under extreme acceleration and deceleration forces. The spacer functions as a critical bearing and positioning element within the motor assembly, preventing axial movement of the motor shaft while allowing free rotation at precise tolerances. This precision fit is essential for brushless motor systems operating at high RPM and for brushed motors delivering peak torque during aggressive driving. The included e-clip is manufactured from spring steel and provides positive mechanical retention, ensuring the spacer cannot work loose during operation. Installation is straightforward for anyone with basic RC maintenance knowledge and access to standard hex tools. The component's design integrates seamlessly with Traxxas's modular drivetrain architecture, maintaining compatibility with suspension upgrades, performance motor installations, and chassis modifications common in the competitive RC racing community.

What's in the Box

• 1x Traxxas motor shaft spacer (steel)
• 1x E-clip retainer ring

Frequently Asked Questions

• What is a motor shaft spacer and why does my RC car need one? — A motor shaft spacer is a precision-engineered ring component that sits on your vehicle's motor shaft between the motor and the rest of the drivetrain assembly. It prevents axial movement of the motor shaft, maintains proper alignment of gears and bearings, and ensures that power is transmitted efficiently from the motor to the wheels. Without proper spacing, your motor could shift position during acceleration, causing binding, noise, or complete drivetrain failure.
• Will the TRX7878X fit my Traxxas RC vehicle? — The TRX7878X is specifically designed for the Traxxas X-Monster chassis (model TRX77036-4-WB) and other compatible Traxxas vehicles using the same drivetrain architecture. Before purchasing, verify that your model number matches the compatibility list or contact our team at RC Model Shop for confirmation of fitment with your specific vehicle.
• How do I install this motor shaft spacer? — Installation requires removing your motor assembly from the chassis and sliding the spacer onto the motor shaft in its correct position. The e-clip is then snapped firmly into the groove on the motor shaft to lock the spacer in place. Most Traxxas vehicles come with an assembly guide, and this is a relatively straightforward maintenance procedure that takes only a few minutes with basic RC tools.
• What is the difference between the steel spacer and composite alternatives? — Steel construction provides superior wear resistance, maintains tighter tolerances over extended use, and delivers better rigidity under load compared to plastic or composite spacers. For high-performance driving and racing applications, steel components offer longer service life and more reliable performance, particularly in brushless motor systems operating at high RPM or in vehicles experiencing extreme acceleration forces.
• Can I use this spacer on any brushless motor? — The TRX7878X is manufactured specifically for Traxxas vehicles and motor installations. While it may fit other brushless systems with identical shaft specifications, we recommend using motor components engineered for your specific vehicle to ensure proper fit, alignment, and performance. Check with RC Model Shop if you have questions about compatibility with non-standard motor installations.
• How often should I replace the motor shaft spacer? — Under normal driving conditions, a quality steel spacer like the TRX7878X should last for many years. However, inspect it regularly during routine maintenance for signs of wear, deformation, or pitting. If you experience drivetrain noise, binding, or performance loss, checking the motor assembly including the spacer should be part of your diagnostic process.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the Traxxas Spacer, motor shaft (steel)/ e-clip (1) TRX7878X today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.