Traxxas Foam Tyre Inserts 1.0 inch Firm 1/18 Scale RC Crawler TRX9874

Overview

The Traxxas Foam Inserts, 1.0in (firm) (2) TRX9874 are essential tuning components designed specifically for RC enthusiasts who want to optimise the performance and handling characteristics of their 1/18 scale TRX-4M trail trucks. Whether you're exploring the world of RC rock crawling for the first time or you're an experienced basher looking to fine-tune your vehicle's suspension response, these foam inserts offer a practical and affordable way to adapt your RC car UK to different terrain conditions and driving styles. Sold as a pair, these firm-density foam inserts represent genuine Traxxas engineering, allowing you to modify how your tyres behave during climbing, cornering and general trail navigation.

Foam tyre inserts are a critical but often overlooked tuning tool in the RC hobby. Unlike the soft foam inserts (model 9875) which are also available, these firm inserts provide a stiffer sidewall and less cushioning, making them ideal for vehicles carrying heavier payloads or drivers who prefer more responsive handling characteristics. By simply swapping your foam inserts, you can dramatically alter the way your TRX-4M responds to inputs without purchasing new wheels or tyres. This makes the Traxxas 1.0in Foam Inserts (firm) an economical choice for RC enthusiasts who want multiple setup options without the expense of buying complete wheel and tyre sets. The ability to account for different vehicle weights and driving conditions means you can keep your RC trail truck performing at its peak, whether you're running stock weight or have added upgrades that increase overall vehicle mass.

RC Model Shop stocks genuine Traxxas parts and upgrades for ready to run RC vehicles and competition-level builds. These foam inserts are compatible with an extensive range of TRX-4M models, making them an essential addition to any TRX-4M owner's spare parts collection. From the iconic Ford Bronco to the Land Rover Defender and Chevrolet K10 High Trail variants, these inserts work across the entire TRX-4M platform, giving you flexibility and consistency across multiple builds.

Key Features

• Firm Foam Density — The firm compound provides a stiffer tyre sidewall and reduced cushioning compared to soft inserts, delivering more responsive handling and improved support for heavier vehicle setups. This makes them particularly suitable for drivers who prioritise precise steering input and wish to reduce tyre roll during aggressive cornering or rock crawling.
• 1.0-Inch Diameter Specification — These inserts are specifically engineered for 1.0-inch wheels and tyres used on 1/18 scale RC trail crawlers, ensuring a perfect fit that maintains proper tyre geometry and performance characteristics without gaps or binding.
• Sold as a Pair — The pack contains two inserts, allowing you to outfit either both front wheels or both rear wheels, or one front and one rear, giving you flexibility in how you configure your suspension tuning across different axles.
• Tuning Versatility — By offering an alternative to soft foam inserts (separately available), these firm inserts expand your tuning palette, allowing you to experiment with different suspension characteristics and find the exact setup that matches your driving style and the terrain you most frequently tackle.
• Designed for TRX-4M Platform — Engineered specifically for the Traxxas TRX-4M rock crawler range, including all colour variants and body styles (Ford Bronco, Land Rover Defender, Chevrolet K10, Ford F-150), ensuring perfect compatibility and optimised performance across the entire model line.
• Genuine Traxxas Manufacturing — These inserts are manufactured to Traxxas quality standards, ensuring consistent material properties, precise dimensions, and reliability that aftermarket alternatives may not provide.

Technical Performance

The Traxxas Foam Inserts operate on a fundamental principle of tyre suspension mechanics. By inserting a foam core inside your tyre, you create a suspension element that absorbs small impacts whilst maintaining tyre shape and contact patch. The firm density of these TRX9874 inserts means they compress less readily than soft alternatives, resulting in a higher natural frequency response. This characteristic makes them ideal for 1/18 scale rock crawling applications where maintaining consistent tyre contact with rocky, uneven terrain is critical. The 1.0-inch wheel diameter specification ensures these inserts fit perfectly within the tiny tyres of 1/18 scale vehicles, where precision fit is essential. The firm compound is engineered to withstand repeated compression cycles without permanent deformation, ensuring long service life even with regular use. When your TRX-4M encounters rocks, roots and obstacles typical of trail crawling, the firm inserts provide a balance between tyre compliance for obstacle navigation and structural support for vehicle weight distribution. The material composition has been developed through Traxxas' extensive RC research and development programme to optimise performance across a range of vehicle weights, from stock TRX-4M models through to heavily upgraded builds with additional armour, winches and accessories that increase overall mass.

What's in the Box

• 2x Traxxas 1.0-inch Firm Foam Tyre Inserts

Frequently Asked Questions

• What is the difference between firm and soft foam inserts for RC crawlers? — Firm foam inserts, like the TRX9874, provide a stiffer sidewall that compresses less during trail use, resulting in more responsive handling and better weight support for heavier builds. Soft foam inserts (model 9875) offer more cushioning and compliance, absorbing impacts more readily. Firm inserts suit drivers who prefer sharper steering response and vehicles carrying additional weight, whilst soft inserts benefit drivers prioritising maximum obstacle absorption and smoother over rough terrain.
• Will these foam inserts fit my TRX-4M RC crawler? — Yes, these 1.0-inch foam inserts are specifically designed for the Traxxas TRX-4M platform and are compatible with all TRX-4M variants including the Ford Bronco, Land Rover Defender, Chevrolet K10, and Ford F-150 High Trail models across all available colour options (Blue, Red, Orange, Black, White, Area 51, Green, Light Blue, Pink, Silver, Tan, Brown).
• Can I mix firm and soft foam inserts on the same vehicle? — Yes, many experienced RC trail crawlers use mixed setups, running firm inserts on the rear axle for stability and soft inserts on the front for improved obstacle climbing. This mixed approach allows you to balance responsiveness with obstacle absorption. You'll need to purchase the soft inserts (model 9875) separately to try this configuration.
• How do I install these foam inserts? — Simply remove your existing foam inserts (if you're upgrading from soft to firm) by peeling or pushing them out from inside the tyre, then insert the new firm foam inserts. Most installers apply a small amount of lightweight adhesive or foam glue around the inside of the tyre bead to keep inserts in place, though some drivers simply press them in dry.
• Do foam inserts wear out and need replacement? — Over time with regular use, foam inserts can compress permanently or develop cracks, reducing their effectiveness. Most RC enthusiasts replace inserts every 12-24 months depending on usage intensity. These Traxxas inserts are engineered for durability, but are consumable maintenance items like shock oil or tyre glue.
• What impact will these firm inserts have on my driving experience? — You'll notice sharper steering response, slightly reduced tyre squat during acceleration, and better cornering stability. The trade-off is slightly less cushioning over very rough terrain. Many drivers switch between firm and soft inserts depending on whether they're running smooth trails or rocky terrain on any given weekend.

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 (firm) (2) TRX9874 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.