Traxxas Foam Tyre Inserts 1.0 Inch Soft Compound Pair TRX9875

Overview

The Traxxas Foam Inserts, 1.0in (soft) (2) TRX9875 are essential performance upgrades for RC enthusiasts looking to fine-tune their 1/18 scale trail trucks. Whether you're running a TRX-4M Ford Bronco, Land Rover Defender, Chevrolet K10, or Ford F-150 High Trail Truck, these soft foam inserts allow you to precisely adjust the climbing and handling characteristics of your tyres, accounting for different vehicle weights and driving conditions. Available as a pair for both front and rear positions, these inserts are specifically engineered to optimise traction and responsiveness on various terrain types. For UK RC car enthusiasts and trail crawling competitors, foam tyre inserts are a recognised upgrade path that can dramatically improve your vehicle's on-track performance without requiring a complete tyre replacement. The soft compound formulation provides excellent compliance on rocky and uneven surfaces, making these inserts ideal for serious trail runners and weekend bashers alike.

Foam inserts represent one of the most cost-effective tuning modifications available for 1/18 scale rock crawler enthusiasts in the UK. By changing the internal support structure of your tyres, you can achieve better grip, improved steering response, and enhanced climbing ability on technical terrain. Traxxas has engineered these soft inserts to work seamlessly with the TRX-4M range, ensuring compatibility and performance straight out of the box. If you're serious about maximising your RC trail truck's potential, these foam inserts should be in your workshop toolbox.

RC Model Shop stocks genuine Traxxas foam inserts, and we understand that every driver has different preferences and requirements. That's why Traxxas also offers firm foam inserts (part number 9874) for those who prefer a stiffer, more responsive feel. Having multiple insert options available means you can experiment and find the exact setup that suits your driving style, your specific track conditions, and your vehicle weight configuration. This flexibility is what separates serious competitors from casual drivers.

Key Features

• Soft Foam Compound — The soft formulation provides maximum compliance and shock absorption, which means your tyres will conform better to uneven and rocky terrain, translating to improved grip and traction during challenging trail runs and rock crawling sessions.
• Sold as a Pair — You receive two inserts in this pack, providing front and rear coverage so you can upgrade both axles of your TRX-4M simultaneously without needing to purchase multiple sets.
• Designed for 1.0-Inch Wheels — These inserts are precisely sized for 1.0-inch diameter wheels found on 1/18 scale trail trucks, ensuring a perfect fit and optimal performance characteristics that Traxxas engineers have validated through extensive testing.
• Universal TRX-4M Compatibility — Whether you own a Ford Bronco, Land Rover Defender, Chevrolet K10, or Ford F-150 High Trail Truck in any colour variant, these soft inserts are engineered to work with all TRX-4M models, making them a universal upgrade for this platform.
• Weight and Terrain Adjustment — By changing your foam inserts, you can account for different vehicle weights and terrain conditions, allowing you to maintain optimal tyre characteristics across varying scales and setup configurations without purchasing different tyres entirely.
• Professional-Grade Tuning — Foam inserts are recognised in the RC community and at competition events as a legitimate and essential tuning tool, used by professional drivers to extract maximum performance from their vehicles.
• Easy Installation — Installation of foam inserts is straightforward and requires no special tools or technical expertise, making this an accessible upgrade even for relatively inexperienced RC enthusiasts.
• Firm Insert Alternative Available — Traxxas also offers firm foam inserts (part number 9874) for drivers who prefer a stiffer setup, allowing you to match your foam insert choice to your specific driving conditions and preferences.

Technical Performance

The Traxxas Foam Inserts represent precision engineering applied to tyre performance optimisation. The soft foam compound is manufactured to exacting standards, delivering consistent performance across multiple drive sessions and varying environmental conditions. For 1/18 scale RC crawlers and trail trucks, tyre foam inserts play a critical role in determining how effectively your vehicle transmits power to the ground and how responsively it handles driver input. The soft formulation is specifically engineered for maximum conformance to irregular surfaces, which is essential when tackling rocky terrain, logs, and other obstacles typical of trail crawling courses. Unlike harder foam inserts which may bounce off challenging terrain, soft inserts absorb impacts more effectively and maintain consistent contact with the ground. This translates to measurable improvements in climbing ability, cornering grip, and overall vehicle stability during technical sections. The 1.0-inch wheel diameter specification ensures these inserts are perfectly calibrated for the geometry and weight distribution of 1/18 scale trail trucks, meaning you're not compromising performance with oversized or undersized inserts. The pair format allows you to upgrade both front and rear positions simultaneously, ensuring balanced handling characteristics across your entire vehicle rather than creating uneven performance between axles. Traxxas has engineered these inserts to withstand repeated use and maintain their performance characteristics over extended periods, making them a durable investment in your RC setup's longevity.

What's in the Box

• Two foam inserts suitable for 1.0-inch wheels
• One pair provides coverage for both front and rear positions

Frequently Asked Questions

• What is the difference between soft and firm foam inserts for TRX-4M? — Soft foam inserts (TRX9875) provide maximum compliance and traction on rocky, uneven terrain, conforming readily to surface irregularities. Firm inserts (part number 9874) offer a stiffer, more responsive feel that some drivers prefer on smoother surfaces or when running heavier vehicle configurations. Soft inserts are generally recommended for serious trail crawling and technical rock sections, whilst firm inserts suit drivers who prioritise steering response and speed.
• Will these soft foam inserts fit my TRX-4M? — Yes, these soft foam inserts are universally compatible with all TRX-4M models, including the Ford Bronco, Land Rover Defender, Chevrolet K10, and Ford F-150 High Trail Truck variants in all available colours. The 1.0-inch wheel size specification ensures perfect fitment across the entire TRX-4M range.
• How do foam inserts improve my RC trail truck's performance? — Foam inserts change the internal structure of your tyres, affecting how they conform to terrain, transmit power, and respond to steering input. Soft inserts improve traction on uneven surfaces by conforming more readily to terrain irregularities, which enhances climbing ability and grip. This is particularly valuable during trail crawling sessions where you encounter rocks, logs, and other challenging obstacles. Many UK RC enthusiasts find that upgrading from standard tyres to foam-inserted tyres produces noticeable improvements in vehicle control and capability.
• Do I need to replace my tyres to use these foam inserts? — No, foam inserts fit inside your existing tyres. You simply remove your current inserts (if any) and replace them with these Traxxas soft inserts. This makes foam inserts an extremely cost-effective upgrade compared to purchasing entirely new tyres.
• How often should I replace foam inserts? — Traxxas foam inserts are durable and should provide extended service life across numerous driving sessions. However, if you notice reduced performance or visible deterioration in the foam material, replacement becomes necessary. Many competitive drivers maintain spare sets of inserts for their RC cars to ensure consistent performance throughout the racing season.
• Are these suitable for beginner RC enthusiasts? — Absolutely. While foam inserts are used by professional competitors to fine-tune performance, they're equally valuable for beginners seeking to improve their vehicle's handling and traction. Installation is straightforward, requiring no specialist knowledge or tools, making these an accessible upgrade for any skill level.

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 Foam Inserts, 1.0in (soft) (2) TRX9875 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.