Associated 12mm Big Bore Shock Spring 72mm 2.40lb AS91640

Overview

The Associated 12mm Big Bore Spring 72mm 2.40lb (AS91640) is a genuine replacement shock spring engineered for precision suspension tuning on competitive and recreational RC cars. Whether you're refreshing worn components, fine-tuning your suspension setup, or maintaining your RC vehicle, this authentic Associated OEM part delivers reliable performance and compatibility with multiple platforms across the Associated range. For enthusiasts of RC cars in the UK, having access to genuine manufacturer replacement parts like this spring is essential for keeping your vehicle performing at its best and maintaining the handling characteristics that define your favourite RC model.

This 12mm big-bore shock spring is specifically designed to work with the larger bore damper assemblies found on modern Associated short-course trucks, touring cars, and off-road buggies. The 72mm length and 2.40lb spring rate make this component ideal for drivers who want to adjust their vehicle's ride height, suspension stiffness, and overall handling balance without investing in a complete new suspension system. Whether you're a weekend basher enjoying casual RC fun or a serious competitor preparing your vehicle for the next race event, replacement springs like this are fundamental spares to keep in your pit bag.

For RC enthusiasts in the UK, sourcing authentic Associated parts ensures that your vehicle maintains its original engineering standards and performance characteristics. This genuine spring comes from the same manufacturer that designed your RC car's complete suspension system, guaranteeing perfect fitment and consistent performance across multiple replacement cycles.

Key Features

• 12mm Big-Bore Design — This spring is specifically engineered for 12mm big-bore damper systems, which provide superior damping control and stability compared to standard shock absorbers. The larger bore diameter allows for more consistent oil flow and better temperature stability during intense driving sessions.
• 72mm Length — The 72mm dimension is precisely calculated to work with the suspension geometry of compatible Associated vehicles, ensuring correct spring compression, ride height, and suspension kinematics for optimal handling.
• 2.40lb Spring Rate — A moderate spring stiffness measured in pounds per inch, this rate is ideal for balanced suspension setups that provide responsive handling without sacrificing ride comfort or traction on varied terrain. The 2.40lb rate suits both track racing and bashing applications.
• Genuine OEM Part — Manufactured by Team Associated, this is the authentic original equipment manufacturer component, not an aftermarket alternative. OEM parts guarantee exact fitment, consistent quality, and the same performance standards used in factory-built RC cars.
• Easy Installation — Replacement springs are among the most straightforward suspension upgrades to install, requiring only basic tools and minimal mechanical knowledge. Simply compress the spring, remove the old component, and install the new spring in its place.
• Suspension Tuning Flexibility — By swapping springs of different rates, you can adjust your vehicle's ride height, chassis attitude, and suspension responsiveness to suit different track conditions, terrain types, and driving styles without modifying other components.
• Quality Assurance — As an authentic Associated part, this spring has undergone the same quality control and testing as the suspension components on brand-new factory-built vehicles, ensuring durability and consistent performance across multiple driving sessions.

Technical Performance

The Associated 12mm Big Bore Spring represents precision engineering in suspension design. Big-bore dampers, compared to their standard counterparts, offer superior performance through larger internal chambers that accommodate more damping oil and provide better thermal stability during extended driving sessions. The 72mm length has been precisely engineered to work with the suspension kinematics of compatible Associated platforms, maintaining correct ride height and suspension geometry for optimal weight distribution and handling. The 2.40lb spring rate sits in the mid-range for Associated vehicles, making it suitable for a wide variety of driving conditions from smooth tarmac circuits to rough terrain and bumpy club tracks. The spring itself is manufactured from high-quality spring steel that resists fatigue and maintains its physical properties over hundreds of compression and extension cycles. The engineering behind big-bore damper systems includes improved oil circulation, better heat dissipation, and more consistent damping characteristics across a wide range of temperatures and driving intensities. This is why serious RC racers prefer big-bore systems for competition use — they maintain performance consistency even when suspension temperatures rise during intense driving. The spring rate directly affects your vehicle's ride height, body roll during cornering, and overall suspension compliance on bumps and obstacles. A 2.40lb spring is soft enough to absorb small track imperfections while remaining stiff enough for responsive cornering and predictable handling during aggressive driving manoeuvres.

Compatibility Guide

This genuine Associated spring is designed to fit the following RC vehicles and platforms:

• Associated RC10 SC5M — 1/10 scale short-course truck
• Associated RC10 T4.2 — 1/10 scale touring car competition platform
• Associated RC10 T5M — 1/10 scale 2WD touring car

Before purchasing, confirm that your specific Associated model uses 12mm big-bore dampers. Refer to your vehicle's instruction manual for detailed suspension specifications and installation guidance. If you're uncertain about compatibility, the team at RC Model Shop can provide expert advice to ensure you order the correct replacement parts for your particular RC car.

What's in the Box

• 1x Associated 12mm Big Bore Spring 72mm 2.40lb (AS91640)

Frequently Asked Questions

• What is the difference between big-bore and standard dampers for RC cars? — Big-bore dampers feature a larger internal diameter, which allows for increased oil capacity and more sophisticated damping control. This results in better temperature stability, more consistent performance during long driving sessions, and superior handling precision compared to standard dampers. Big-bore systems are preferred for competitive RC racing and high-performance applications.
• Will this spring fit my Associated RC car? — This spring is designed for vehicles that use 12mm big-bore damper assemblies. Compatible models include the RC10 SC5M, RC10 T4.2, and RC10 T5M. Always check your vehicle's manual to confirm it uses 12mm big-bore dampers before purchasing. If you're unsure, contact RC Model Shop for compatibility confirmation.
• How often should I replace my shock springs? — Springs can be replaced as part of regular maintenance if they become damaged or develop a flat spot, or if you want to change your suspension tuning to suit different track conditions. Competitive racers often carry spare springs of different rates to test setup changes during events. With normal use, a quality spring like this should provide many months or years of reliable service.
• What does the 2.40lb spring rate mean? — Spring rate measures how much force is required to compress the spring by one inch. A 2.40lb rate means the spring requires 2.40 pounds of force for each inch of compression. This moderate rate makes the spring suitable for balanced handling that works well across various driving conditions without being too soft or too stiff.
• Can I use this spring to adjust my RC car's ride height? — Yes, springs are one of the primary components used for suspension tuning and ride height adjustment. By changing the spring rate or adjusting how the spring sits in the damper, you can modify your vehicle's chassis attitude and ground clearance. Softer springs (lower rates) increase ride height, whilst stiffer springs (higher rates) lower it.
• Is this suitable for both racing and recreational bashing? — Yes, the 2.40lb rate is versatile enough for both competitive track racing and recreational off-road bashing. However, different driving styles and track conditions may benefit from different spring rates. This particular rate is a good starting point for most drivers and most conditions.
• Why should I choose genuine Associated parts? — Genuine OEM parts are engineered specifically for your vehicle by the manufacturer, guaranteeing exact fitment and consistent performance. They undergo the same quality control as suspension components on brand-new factory-built vehicles, ensuring reliability and longevity. Authentic parts also maintain the engineering integrity and handling characteristics your RC car was designed for.

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 SPRING 72MM 2.40LB AS91640 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.