Team Associated 12mm Big Bore Rear Spring Yellow 2.40 lb AS91340

Overview

The Associated 12mm Big Bore Rear Spring Yellow 2.40 lb (part number AS91340) is a precision-engineered suspension component designed for serious RC enthusiasts who demand professional-grade performance from their 1/10 scale off-road vehicles. This optional Team Associated rear spring is engineered specifically for RC cars UK builders and competitors who have equipped their vehicles with the optional 12mm Big Bore Shock Set. Whether you're dialling in your suspension setup for high-grip track conditions or fine-tuning your off-road machine for competition, this yellow spring offers a firmer rear setup that significantly enhances handling precision and reduces unwanted chassis roll during aggressive cornering.

Team Associated has long been recognised as one of the leading manufacturers of premium RC buggy and truck components, and this rear spring exemplifies their commitment to quality and performance. The 2.40 lb yellow spring sits in the stiffer range of the 12mm big bore spring rates, making it the ideal choice for drivers seeking decreased chassis roll, increased responsiveness, and sharper steering feedback on higher-grip surfaces. This is an essential spare part for anyone running an RC10B4, RC10B44, RC10T4, or SC10 platform vehicle, and it's equally compatible with the newer .1 and .2 generation variants of these legendary Team Associated models.

If you're serious about RC car performance in the UK market, you understand that suspension tuning is fundamental to competitive success. This yellow 2.40 lb spring gives you the precise control needed to optimise your vehicle's handling characteristics across different track conditions and driving styles. It's a must-have spare for your parts box and an essential upgrade component for anyone looking to refine their suspension geometry.

Key Features

• 2.40 lb Spring Rate (Yellow) — This spring rate is specifically calibrated to provide a firmer rear suspension setup compared to softer alternatives, delivering decreased chassis roll and increased responsiveness that translates directly to more predictable and controlled handling during competitive runs and weekend bashings alike.
• 12mm Big Bore Compatibility — Engineered exclusively for use with the Team Associated optional 12mm Big Bore Shock Set, this spring integrates seamlessly into your existing shock platform, ensuring perfect fitment and reliable performance without any modification.
• Reduces Chassis Roll — By choosing this stiffer yellow spring over softer alternatives, you'll experience significantly reduced chassis roll during cornering, which is crucial for maintaining grip and precision steering input on high-traction surfaces and prepared tracks.
• Sharper Handling on High-Grip Surfaces — The 2.40 lb rate is specifically tuned to deliver superior handling characteristics on high-grip racing surfaces, giving you the responsiveness needed to extract maximum performance from your RC buggy or truck.
• Decreased Traction Loss — Unlike softer springs that allow excessive chassis flex, this stiffer yellow spring minimises traction loss by keeping the chassis planted more consistently, particularly beneficial on clay tracks and high-grip carpet surfaces.
• Professional Team Associated Quality — As an official Team Associated spare part, this spring meets the same rigorous quality standards applied to complete factory vehicles, ensuring durability and consistency across multiple seasons of use.
• Part of Complete Spring Range — This yellow spring is one of six different spring rates available in the 12mm big bore range, from 1.90 lb black through to 2.40 lb yellow, allowing you to dial in your suspension precisely for any track condition or driving preference.
• Compatible with Multiple Platforms — Whether you're running an SC10, SC10.2, SC10GT, RC10B4, RC10B4.1, RC10B4.2, RC10B44, RC10B44.1, RC10B44.2, RC10T4, RC10T4.1, or RC10T4.2, this spring will fit and perform consistently across all these Team Associated 1/10 scale platforms.

Technical Performance

The Associated 12mm Big Bore Rear Spring Yellow 2.40 lb represents the culmination of decades of Team Associated engineering expertise applied to precision suspension design. This spring is manufactured to exacting tolerances using high-quality spring steel, ensuring consistent performance characteristics across multiple use cycles and environmental conditions. The yellow colour-coding is the industry standard across RC car UK circles for identifying this specific 2.40 lb spring rate, making identification quick and foolproof even when you have multiple spring rates in your pit box. The spring's engineering delivers measurable performance improvements when used in conjunction with the 12mm Big Bore Shock Set: drivers will notice immediately decreased chassis roll during high-speed cornering, increased responsiveness to steering inputs, and improved overall handling stability on high-grip racing surfaces. The stiffer characteristics of this spring make it particularly effective on prepared indoor carpet tracks and clay surfaces where maximum grip and minimal chassis movement are desirable. For off-road RC buggy and truck racing in the UK, where competition standards are particularly high, this spring rate sits perfectly in the intermediate-to-stiffer range, giving you the handling characteristics needed to compete successfully without sacrificing ride quality entirely. The spring rate itself—measured at 2.40 lb per inch of compression—has been precisely calibrated by Team Associated to work in harmony with the geometry and suspension kinematics of their 1/10 scale competition vehicles.

What's in the Box

• One Team Associated 12mm Big Bore Rear Spring (Yellow, 2.40 lb rate)

What You Need to Complete

• Team Associated 12mm Big Bore Shock Set (required for compatibility—this spring is designed specifically for use with this shock system)
• Appropriate 1/10 scale RC buggy or truck fitted with compatible suspension geometry

Spring Rate Comparison Guide

Understanding the complete range of 12mm big bore spring rates available from Team Associated will help you choose the ideal setup for your specific racing conditions and driving preferences:

• ASC91335 – 12mm Rear Spring Black/1.90 lb — The softest option in the range, offering increased chassis roll and traction, better performance in bumpy conditions, but more likelihood of bottoming out on high-speed jumps.
• ASC91336 – 12mm Rear Spring Green/2.00 lb — A soft-to-medium spring rate providing improved traction and ride comfort while maintaining reasonable handling stability.
• ASC91337 – 12mm Rear Spring White/2.10 lb — A mid-range spring offering balanced characteristics between traction and handling, ideal for mixed track conditions.
• ASC91338 – 12mm Rear Spring Grey/2.20 lb — A medium-to-stiff option delivering improved responsiveness whilst still maintaining adequate traction.
• ASC91339 – 12mm Rear Spring Blue/2.30 lb — A stiff spring rate for drivers seeking maximum responsiveness and minimal chassis roll, with slightly reduced traction.
• ASC91340 – 12mm Rear Spring Yellow/2.40 lb — The stiffest option in the range, delivering maximum chassis control, decreased roll, and increased responsiveness on high-grip surfaces.

Effects of Spring Rate Changes Explained

When considering suspension tuning for your RC car, understanding how spring rate changes affect vehicle behaviour is essential. Softer spring rates (black and green, 1.90-2.00 lb) increase overall chassis roll during cornering, which can be beneficial for traction on low-grip surfaces and provides better absorption of bumps and track imperfections. However, softer springs are more likely to cause bottoming out on big jumps and high-speed sections. Stiffer spring rates (blue and yellow, 2.30-2.40 lb) decrease chassis roll significantly, improve steering responsiveness, and help maintain consistent vehicle attitude, but they reduce overall traction slightly and may cause the vehicle to feel harsher over bumpy terrain. The yellow 2.40 lb spring sits at the stiff end of this spectrum, making it the choice for drivers prioritising handling precision and chassis control on prepared, high-grip racing surfaces throughout the UK competitive RC scene.

Compatibility and Vehicle Platforms

This yellow 2.40 lb rear spring is specifically engineered for Team Associated 1/10 scale vehicles equipped with the optional 12mm Big Bore Shock Set. Full compatibility exists with the following Team Associated platforms: the legendary SC10 and its successors SC10.2 and SC10GT short course trucks; the RC10B4 family including RC10B4.1 and RC10B4.2; the RC10B44 family including RC10B44.1 and RC10B44.2; and the RC10T4 family including RC10T4.1 and RC10T4.2. All of these platforms share compatible suspension geometry and shock mounting points when fitted with the 12mm Big Bore system, making this spring a direct bolt-on upgrade or replacement component for any of these vehicles. It's essential to verify that your vehicle is indeed equipped with the 12mm Big Bore Shock Set before purchasing this spring, as it is specifically designed for this shock system and will not be compatible with standard 12mm or 13mm shock systems.

Frequently Asked Questions

• What is the difference between the yellow 2.40 lb spring and softer spring rates in the 12mm big bore range? — The yellow 2.40 lb spring is the stiffest option available in the 12mm big bore range. Compared to the black 1.90 lb spring, it provides significantly decreased chassis roll (meaning less body lean during cornering), increased responsiveness to steering inputs, and sharper overall handling. The trade-off is slightly reduced traction and a firmer ride over bumpy terrain. The yellow spring is ideal for high-grip racing surfaces, whilst softer rates like black and green are better for low-grip or bumpy conditions.
• Which Team Associated RC cars are compatible with this spring? — This spring is compatible with any Team Associated 1/10 scale vehicle equipped with the optional 12mm Big Bore Shock Set, including the SC10, SC10.2, SC10GT, RC10B4, RC10B4.1, RC10B4.2, RC10B44, RC10B44.1, RC10B44.2, RC10T4, RC10T4.1, and RC10T4.2. It is essential that your vehicle has the 12mm Big Bore shocks installed, as this spring is designed exclusively for that system.
• Is this a rear spring only or does it come as a pair? — This is a single rear spring. If you need to replace both rear springs on your vehicle, you should order two of these springs.
• How does spring rate affect vehicle handling on the track? — Spring rate directly controls how much your vehicle's chassis rolls during cornering. The yellow 2.40 lb rate in this product is stiffer than alternatives, so it minimises chassis roll, keeps the vehicle planted more consistently, and improves steering precision on high-grip surfaces. This makes it ideal for prepared tracks and competitive racing. Softer springs allow more chassis movement, which can actually improve traction on low-grip surfaces but reduces handling precision.
• Should I use this spring if I race on clay tracks? — Yes, this yellow 2.40 lb spring is particularly well-suited for clay track racing in the UK, as clay typically provides high grip. The stiffer rate will keep your vehicle's chassis planted and responsive, allowing you to maintain maximum control during high-speed runs and competitive heats.
• Can I mix spring rates, using a stiffer spring at the rear and a softer spring at the front? — Yes, mixing spring rates is a common and effective tuning strategy. You can use the yellow 2.40 lb rear spring in combination with different front spring rates to dial in your vehicle's balance and handling characteristics for specific track conditions. Experiment with combinations to find the sweet spot for your driving style.
• How often should I replace my rear spring? — Springs can eventually lose their tension over extended use, affecting handling characteristics. If you notice your vehicle's handling becoming softer or less responsive, or if you see visible damage to the spring, it's time to replace it. Keeping spare springs in your pit box is essential for any serious RC racer.
• What makes Team Associated springs different from aftermarket alternatives? — Team Associated springs are manufactured to the same rigorous standards as their complete vehicles. They're precision-engineered to work perfectly with Team Associated shock geometry and suspension kinematics, ensuring consistent performance and reliability. Using genuine Team Associated parts ensures your vehicle performs exactly as the engineers designed it.

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 Associated 12mm Big Bore Rear Spring Yellow 2.40 lb AS91340 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.