Traxxas Motor Mount Hinge Post Fixed Gear Adapter TRX8661

Overview

The Traxxas Motor mount hinge post / fixed gear adapter (TRX8661) is an essential component for RC enthusiasts looking to expand the compatibility and functionality of their Traxxas vehicles. This precision-engineered part is specifically designed to work with Traxxas RC models, providing the critical interface between motor mounting systems and gear adapters. Whether you're a dedicated RC car UK hobbyist, a weekend basher, or someone looking to upgrade their ready to run RC setup, this OEM Traxxas component ensures reliable performance and proper mechanical alignment that aftermarket alternatives simply cannot match.

This motor mount hinge post and fixed gear adapter combination represents Traxxas's commitment to quality engineering and compatibility across their extensive RC car range. The inclusion of both metric fasteners (5x25mm BCS and 4x16mm CS with split and flat washers) means you have everything needed for secure installation right out of the box. For those serious about maintaining their brushless RC cars or upgrading their RC hobby setup, investing in genuine OEM Traxxas parts like the TRX8661 is a decision that pays dividends in reliability, longevity and performance.

RC Model Shop stocks this genuine Traxxas component as part of our comprehensive range of RC car parts and accessories for the UK market. Whether you're building your first RC vehicle from a race kit or maintaining a competition-grade machine, having access to authentic Traxxas replacement parts is crucial for keeping your RC investment in peak condition. The TRX8661 is engineered to exacting specifications and will integrate seamlessly with compatible Traxxas RC platforms.

Key Features

• Motor mount hinge post design — This component provides the critical pivot point for motor mounting systems, allowing for proper alignment and adjustment of motor position relative to the drivetrain, which is essential for optimal power transfer and handling characteristics in your RC vehicle.
• Fixed gear adapter functionality — The integrated gear adapter ensures stable, non-slip connection between the motor output shaft and the transmission system, preventing gear slippage and maintaining consistent power delivery during acceleration and high-speed running.
• Precision metric fasteners included — The package includes one 5x25mm BCS (button cap screw) and one 4x16mm CS (cap screw) along with split and flat washers, providing secure fastening without the risk of loose connections that could compromise performance or cause mechanical failure.
• OEM Traxxas engineering — As a genuine Traxxas original equipment manufacturer component, the TRX8661 is manufactured to the exact specifications and tolerances used in factory-built Traxxas RC models, ensuring perfect fitment and reliability.
• Split and flat washer system — The inclusion of both split washers (which prevent fastener loosening due to vibration) and flat washers (which distribute load evenly) demonstrates Traxxas's attention to detail in preventing common failure modes in RC vehicles.
• Compatible with multiple Traxxas platforms — This universal motor mount adapter works across multiple Traxxas vehicle types and generations, making it a valuable component to have in your RC spare parts collection.

Technical Performance

The Traxxas Motor mount hinge post / fixed gear adapter TRX8661 represents precision engineering at the component level. The motor mount hinge post provides the critical mechanical interface between the motor assembly and the chassis, allowing for precise alignment and adjustment of the motor's position relative to the spur gear and pinion arrangement. This is vital for maintaining proper mesh between gears, which directly affects efficiency, noise levels, and longevity of the drivetrain. The fixed gear adapter portion ensures that gear selection remains stable and consistent, preventing the common issue of gear slip that can occur during aggressive acceleration or high-load conditions. The 5x25mm BCS fastener is precisely dimensioned for critical mounting points requiring maximum holding strength, whilst the 4x16mm CS fastener handles secondary attachment points. The combination of both split washers (which feature a gap design that prevents vibration-induced loosening) and flat washers (which provide even load distribution across mounting surfaces) reflects engineering best practice for vibration-prone RC applications. Built from durable materials and manufactured to Traxxas's rigorous quality standards, this component will provide years of reliable service in your RC car, whether you're running a ready to run RC setup or a highly tuned competition platform.

What's in the Box

• 1x Motor mount hinge post
• 1x Fixed gear adapter
• 1x 5x25mm button cap screw (BCS)
• 1x 4x16mm cap screw (CS)
• 1x Split washer
• 1x Flat washer

Frequently Asked Questions

• What Traxxas RC models is the TRX8661 motor mount compatible with? — The TRX8661 is designed as a universal motor mount component across multiple Traxxas platforms. Compatibility varies by specific model, so we recommend checking your vehicle's parts diagram or contacting our team at RC Model Shop to confirm fitment for your particular RC car. This ensures you're ordering the correct part for your specific Traxxas model.
• Why would I need to replace my motor mount hinge post? — Motor mount components can wear out over time due to vibration, impact, or normal use in RC vehicles. Additionally, damage from crashes or aggressive driving may require replacement. The motor mount directly affects gear mesh and drivetrain efficiency, so a worn or damaged mount can cause power loss, increased noise, and premature wear of other components.
• What is the difference between a motor mount hinge post and a fixed gear adapter? — The motor mount hinge post provides the mechanical pivot and alignment point for the motor assembly, allowing positional adjustment and secure mounting to the chassis. The fixed gear adapter, by contrast, ensures that gears remain in their intended mesh position without slipping or shifting under load. Together, they create a complete motor mounting solution that maintains proper alignment and mechanical integrity.
• Is this suitable for both brushless and brushed RC motors? — Yes, the TRX8661 motor mount hinge post and fixed gear adapter is designed to work with both brushless and brushed motor systems used in compatible Traxxas RC platforms. The component itself is motor-type agnostic; what matters is compatibility with your specific Traxxas vehicle model.
• How do I know if my motor mount needs replacing? — Signs that your motor mount may need attention include visible cracks or damage to the plastic, excessive play or movement between the motor and chassis, poor gear mesh (visible as uneven wear patterns), grinding or unusual noises from the drivetrain, or poor acceleration performance. If you notice any of these issues in your RC car, inspect the motor mount and consider replacement if damaged.
• Do the fasteners need any special tools for installation? — The included 5x25mm BCS (button cap screw) and 4x16mm CS (cap screw) can be installed with standard metric hex key tools. Most RC hobbyists will have the appropriate sizes in their toolbox, but ensure you have 2mm and 1.5mm hex keys available, along with a small Phillips head screwdriver for any associated hardware.

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 Motor mount hinge post / fixed gear adapter / 5x25mm BCS (1pc) / 4x16mm CS with split and flat washer (1pc) TRX8661 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.