Z-S0407

Overview

The RC4WD 12MM MINI HEX WHEEL WIDENER SET (+15MM) Z-S0407 is an essential upgrade for serious RC crawler and scale truck enthusiasts in the UK. Whether you're running a Tamiya F-350, Tundra, Jeep, Axial AX10, Losi Crawler, RC4WD Timberwolf, or Bully, this precision-engineered wheel widener set transforms your RC vehicle's stance and handling characteristics. These CNC-machined wideners are specifically designed for 12mm back hex wheels, increasing your truck's track width by approximately 15mm per side for a more stable, aggressive appearance that improves cornering performance and overall vehicle dynamics.

If you're building a ready to run RC car or upgrading your existing crawler, track width is a critical factor that affects both the aesthetic appeal and the performance of your rig. The RC4WD mini hex wheel widener set addresses this need with professional-grade engineering and attention to detail. Every component in this set is manufactured to exacting standards, ensuring perfect fitment and longevity. This is the kind of upgrade that separates weekend bashers from serious scale RC enthusiasts who demand precision performance from their vehicles.

RC Model Shop stocks the full range of RC4WD upgrades and spares, making it your one-stop shop for wheel wideners, axles, and other scale performance parts for your RC crawler UK setup. These wideners work seamlessly with a wide variety of popular RC models, giving you the flexibility to customise your vehicle exactly how you want it. With stainless steel hardware included and precision spacers for fine-tuning, this is an investment in quality that will serve your RC hobby for years to come.

Key Features

• CNC-Machined Construction — Every widener in this set is precision-machined using computer numerical control, ensuring consistent quality, perfect dimensions and reliable fitment across all four pieces. This manufacturing method guarantees that each widener is identical, eliminating fitment issues and ensuring your truck sits perfectly balanced.
• Stainless Steel Mini Barrel Nuts — The set includes genuine stainless steel barrel nuts that provide a secure, clean fastening solution. Stainless steel resists corrosion and oxidation, making these hardware components suitable for outdoor use and ensuring they remain visually pristine and functionally reliable even after extended use in various weather conditions.
• 15mm Track Width Increase Per Side — By adding these wideners, your RC crawler gains approximately 15mm of additional track width on each side, resulting in a 30mm total increase in overall stance. This wider stance dramatically improves stability during cornering, reduces the likelihood of tip-overs on uneven terrain, and gives your truck that authentic scale appearance with an aggressive, planted look.
• Precision Spacer System — The set includes eight 1mm spacers and eight 1.2mm spacers, all featuring M6 holes for precise alignment. These silver-anodised spacers allow fine-tuning of your wheel offset and clearances, enabling you to achieve the exact setup that suits your driving style and terrain preferences.
• Universal Hex Compatibility — Designed specifically for 12mm back hex wheels, these wideners are compatible with numerous popular RC models from leading manufacturers including Tamiya, Axial, Losi, and RC4WD. This versatility means you can use them across multiple builds or upgrade vehicles within your collection.
• Compact Design — With an outer diameter of just 13mm and a width of only 1.1mm, these wideners maintain a sleek, scale-appropriate profile whilst still delivering substantial performance benefits. The internal diameter of 6.2mm ensures perfect fitment over standard 12mm hex shafts without any play or looseness.
• Complete Installation Package — Everything you need for installation is included in the box, eliminating the frustration of searching for compatible fasteners and spacers. The thoughtfully-included variety of spacer thicknesses means you can dial in the perfect fit for your specific vehicle configuration.

Technical Performance

The RC4WD 12MM MINI HEX WHEEL WIDENER SET represents the pinnacle of aftermarket scale RC performance engineering. Each widener is manufactured through precision CNC machining, a process that removes material from solid stock using computer-controlled cutting tools to achieve tolerances far tighter than standard manufacturing methods. This ensures that every widener in the set is perfectly consistent, eliminating the fitment problems that can occur when components are manufactured using less precise methods. The outer diameter specification of 0.51 inches (13mm) and width of 0.04 inches (1.1mm) are engineered to mount cleanly on 12mm hex shafts without any wobble or movement. The internal diameter of 0.24 inches (6.2mm) provides the perfect fit over M6 threaded holes, which is the industry standard for RC crawler applications. The inclusion of precision spacers in two different thicknesses (1mm and 1.2mm) demonstrates RC4WD's understanding of real-world installation requirements — different vehicle setups require different offset adjustments, and having both spacer sizes in the package means you won't need to purchase additional components. The stainless steel barrel nuts resist rust and corrosion, maintaining their appearance and function even when exposed to rain, mud, and other outdoor elements that are part of serious RC crawler driving. When installed properly using the included hardware, these wideners transform your truck's handling dynamics by lowering the centre of gravity relative to the track width, reducing body roll during aggressive cornering and improving traction on uneven terrain.

What's in the Box

• 4x Mini 12mm Wheel Widener (CNC-machined)
• 4x Stainless Steel Mini Barrel Nuts
• 8x 1mm Spacer with M6 Hole (Silver anodised)
• 8x 1.2mm Spacer with M6 Hole (Silver anodised)

Suggested Compatible Models

This wheel widener set is engineered specifically for 12mm back hex wheels and has been tested as compatible with the following popular RC crawler and scale truck models:

• Tamiya F-350
• Tamiya Tundra
• Tamiya Jeep
• Axial AX10
• Losi Crawler
• RC4WD Timberwolf
• RC4WD Bully

Frequently Asked Questions

• What is a wheel widener and why do I need one for my RC crawler? — A wheel widener is a spacer that mounts between your wheel hub and your wheel, pushing the wheel further outward and increasing your vehicle's total track width. This wider stance improves stability during cornering, reduces tip-over risk on uneven terrain, and gives your RC crawler a more authentic, aggressive appearance that mirrors the stance modifications made to full-size off-road vehicles. For serious RC enthusiasts running scale crawlers, wideners are considered an essential upgrade rather than a luxury item.
• Are these wideners compatible with my specific RC model? — These wideners are designed for any RC model that uses 12mm back hex wheels. The compatibility list includes Tamiya F-350, Tundra, and Jeep models, Axial AX10, Losi Crawlers, RC4WD Timberwolf and Bully. If your model uses 12mm hex wheels on the rear axle, these wideners will fit. If you're uncertain whether your vehicle uses 12mm hex wheels, measure the hole diameter in your wheel centre — if it's 12mm and threaded, these wideners are designed for your rig.
• What is the difference between the 1mm and 1.2mm spacers included in the set? — Both spacer thicknesses are included to provide flexibility in fine-tuning your vehicle's wheel offset and clearances. Some installation scenarios may require more spacer thickness than others depending on your specific vehicle configuration, brake setup, and suspension geometry. Having both options means you can achieve the perfect fitment without needing to order additional components.
• How do I install these wheel wideners? — Installation involves removing your wheel, sliding the widener onto the hex shaft, adding the appropriate spacer thickness, then reinstalling the barrel nut. The spacers sit between the widener and the wheel to fine-tune offset. Standard installation tools like a hex driver and wrench are all you need. If you're new to RC vehicle maintenance, our team at RC Model Shop is happy to provide guidance during the installation process.
• Will these wideners affect my vehicle's handling characteristics? — Yes, in positive ways. The increased track width lowers your vehicle's centre of gravity relative to the wheelbase, which reduces body roll during cornering and improves traction. You may notice that your crawler feels more planted and stable, especially during aggressive driving on rough terrain. Some users also report improved weight distribution and more predictable handling through technical sections.
• Are these stainless steel fasteners weather-resistant? — Yes, the included stainless steel barrel nuts are naturally corrosion-resistant and will maintain their appearance and function even with repeated exposure to moisture, mud and rain. This makes them ideal for RC crawlers that are regularly driven outdoors in various weather conditions. The silver-anodised spacers are also treated to resist oxidation.
• Can I use these wideners on multiple vehicles? — Absolutely. If you have multiple RC models that use 12mm back hex wheels, you can transfer these wideners between vehicles. Many RC enthusiasts maintain a collection of vehicles and appreciate upgrades that offer this kind of flexibility and cross-compatibility.

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 RC4WD 12MM MINI HEX WHEEL WIDENER SET (+15MM) Z-S0407 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.