FTTX329BR

Overview

The Fastrax TRX-4 Brass Knuckle Weight Basic Version is a precision chassis tuning component designed specifically for Traxxas TRX-4 1/10 scale 4WD crawlers. This upgrade part is engineered for enthusiasts who demand improved weight distribution and handling characteristics on their RC crawler trucks. Whether you're tackling technical trail courses, rock crawling competitions, or weekend bashing sessions across the UK, these brass knuckle weights offer a measurable enhancement to your TRX-4's performance and balance.

Crafted from high-quality brass material, this two-piece set delivers added mass precisely where it's needed most—at the knuckle joints of your suspension geometry. For anyone serious about optimising their RC crawler's behaviour over challenging terrain, this represents an essential upgrade. The basic version of this tuning component provides excellent value for money whilst maintaining the quality standards you'd expect from Fastrax, a recognised name in RC performance upgrades.

This product is perfect for existing TRX-4 owners who want to fine-tune their vehicle's centre of gravity, improve cornering stability, and achieve better weight distribution across the chassis. RC car enthusiasts across the UK continue to choose Fastrax upgrades for their vehicles because they deliver noticeable real-world improvements without requiring complex installation procedures.

Key Features

• Brass Construction — Made from solid brass material, these knuckle weights provide superior durability and precise weight distribution compared to plastic alternatives. Brass offers an excellent strength-to-weight ratio and maintains its integrity through countless hours of RC crawler operation.
• Two-Piece Set — This package includes a pair of knuckle weights, allowing you to upgrade both front and rear knuckle positions for balanced, symmetrical weight distribution across your entire TRX-4 chassis.
• TRX-4 Specific Design — Engineered exclusively for Traxxas TRX-4 crawlers, these weights integrate seamlessly with the OEM knuckle geometry without modification or adaptation. The precision fit ensures no wasted material and optimal functionality.
• Basic Version Specification — This basic version provides the fundamental weight upgrade without additional modifications, making it an accessible entry point for chassis tuning. It's designed for drivers who want to improve handling characteristics without over-complicating their setup.
• Included Hardware — Supplied with all necessary screws and fastening components, allowing you to install these weights immediately upon receipt without hunting for replacement hardware.
• Improves Handling Characteristics — Adding controlled weight to the knuckle assembly helps stabilise the vehicle during technical climbing, reduces body roll during cornering, and creates a lower centre of gravity for improved traction and control on uneven terrain.
• Compatible with Multiple TRX-4 Variants — These weights are compatible with an extensive range of Traxxas TRX-4 models including the Chevrolet K10 Cheyenne High Trail Edition, Ford F-150 Ranger XLT High Trail Edition, Chevrolet K5 Blazer, Nissan Pathfinder SE-V6, Ford Bronco, Defender 4WD, and TRX-4 Sport variants across all colour options.

Technical Performance

The Fastrax TRX-4 Brass Knuckle Weight Basic Version represents intelligent chassis engineering for serious RC crawler enthusiasts. By increasing mass at the knuckle joints—the critical connection points between suspension and steering geometry—these weights fundamentally improve how your TRX-4 behaves in demanding situations. The brass construction ensures longevity and reliability through thousands of rock-crawling passes, technical hill climbs, and terrain-specific challenges that UK-based RC crawler drivers encounter regularly. When installed correctly, the weight distribution created by this two-piece set lowers the overall centre of gravity, which translates to measurable improvements in stability during side-slope climbing, reduced body roll whilst navigating obstacles, and enhanced grip when negotiating loose or technical terrain. The engineering principle behind knuckle weighting is straightforward but effective: by placing additional mass at the suspension's outermost points, you create a more stable platform for weight transfer during aggressive manoeuvres. This is particularly valuable for TRX-4 owners who participate in crawler competitions or regularly tackle natural terrain obstacles. The basic version strikes an excellent balance between performance enhancement and straightforward installation, making it suitable for both experienced builders optimising their competition setups and intermediate hobbyists looking to elevate their crawler's capabilities.

What's in the Box

• Fastrax TRX-4 Brass Knuckle Weight pair (2 pieces)
• Installation screws and fastening hardware

Frequently Asked Questions

• Will the Fastrax brass knuckle weights improve my TRX-4's climbing ability on rocky terrain? — Yes, these weights enhance stability by lowering the centre of gravity and improving weight distribution across the suspension geometry. This results in better traction and more controlled climbing on technical rock and log obstacles. The added mass at the knuckles helps the vehicle maintain grip during weight transfers on challenging terrain.
• Which TRX-4 models are compatible with these brass knuckle weights? — These weights are designed for all standard Traxxas TRX-4 variants, including the Chevrolet K10 Cheyenne High Trail Edition (available in red, metallic copper, black, metallic silver, and metallic blue), the Ford F-150 Ranger XLT High Trail Edition (blue, black, and brown), the 1972 Chevrolet K5 Blazer High Trail Edition (red and blue), the 1979 Chevy Blazer, the Nissan Pathfinder SE-V6 3S 4x4 RTR (silver and red), the 2021 Ford Bronco (orange, black, red, and white), the Defender 4WD (red, silver, green, and sand), TRX-4 Sport variants (orange, grey, metallic blue), and the unassembled chassis kit. They are not compatible with significantly modified or non-standard TRX-4 builds.
• Is this a difficult upgrade to install on my RC crawler? — No, these brass knuckle weights are straightforward to install. They come complete with all necessary screws and fastening hardware. Most RC enthusiasts can complete installation in under 15 minutes with basic tools. The weights simply bolt onto the existing knuckle positions without requiring modification to your chassis or suspension components.
• What is the difference between the basic version and other knuckle weight options? — The basic version provides essential weight distribution benefits without additional modifications or variable mass options. It's designed as an entry-level tuning solution for drivers who want noticeable improvements without complexity. Other versions might include adjustable mass or alternative configurations, but this basic version delivers reliable, consistent performance enhancement for most crawling applications.
• Will adding these weights significantly affect my TRX-4's battery life or runtime? — The additional weight is modest and distributed across the suspension geometry, so runtime impact is minimal. However, you may notice slightly increased motor strain on very demanding terrain, particularly during extended climbing sessions. For most casual and competitive crawling, the performance benefits outweigh any negligible runtime reduction.
• Can I install just one weight, or do I need to install both? — Whilst technically possible to install just one, Fastrax recommends installing both pieces for balanced weight distribution and symmetrical handling characteristics. Installing only one weight could create uneven handling and unpredictable behaviour during cornering or obstacle negotiation. For optimal results, use the complete two-piece set.

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 Fastrax TRX-4 Brass Knuckle Weight Basic Version 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.