Overview
The Associated 12MM Big Bore Spring 54mm 4.45Lb (AS91637) is a precision suspension component designed for serious RC enthusiasts who demand fine-tuned performance from their off-road RC cars in the UK. This high-quality spring is purpose-built for 12mm big bore shock setups and represents the kind of professional-grade tuning part that separates competitive racers from casual bashers. Whether you're dialling in your RC10SC5M short course truck, optimising your RC10T5M buggy for track conditions, or maintaining your RC10T4.2 competition vehicle, this spring delivers the consistency and reliability that Associated is renowned for across the RC model shop community.
Big bore shocks have become the gold standard in competitive RC racing, and the suspension system is absolutely critical to lap times, handling characteristics and overall vehicle performance. The 54mm length and 4.45 lb spring rate of this component give you precise control over your vehicle's ride height, compliance and weight transfer during cornering and acceleration. This is exactly the kind of upgrade component that makes the difference between a fast RC car and a championship-winning RC car. Whether you're replacing worn suspension components, experimenting with different spring rates for track day conditions, or building up a complete custom suspension setup, the AS91637 is an essential part for any serious RC hobbyist in the UK looking to extract maximum performance from their Associated vehicles.
RC Model Shop stocks this genuine Associated spare part as part of our comprehensive range of suspension upgrades and tuning components. As an authorised Associated dealer, we carry the full range of original spares and upgrades to keep your RC vehicle performing at its peak, whether you're competing at the highest level or simply enjoying weekend bashings with friends.
Key Features
- 12mm Big Bore Design — The 12mm diameter provides superior damping stability and smoother suspension action compared to smaller bore sizes, which is essential for maintaining consistent handling over rough terrain and maintaining lap time consistency throughout a race day.
- 54mm Precise Length — The exact 54mm length ensures perfect fitment to Associated big bore shock bodies, guaranteeing correct ride height geometry and suspension geometry angles critical to vehicle handling and performance.
- 4.45 lb Spring Rate — This specific spring rate has been engineered to provide the ideal balance between compliance for soaking up track bumps and support for maintaining vehicle stability during aggressive cornering and weight transfer manoeuvres.
- Genuine Associated Component — As an original equipment manufacturer part, this spring is manufactured to the exact specifications and quality standards that Associated uses in their factory race kits, ensuring compatibility and performance reliability.
- Professional-Grade Tuning Part — This spring enables serious tuning adjustments for competitive racing, allowing you to fine-tune your suspension setup to match specific track conditions, driving style and vehicle weight distribution preferences.
- Maintenance and Upgrade Ready — Perfect for replacing worn suspension springs or experimenting with different spring rates as part of a comprehensive suspension tuning programme, making it invaluable for any serious RC enthusiast.
Technical Performance
The Associated AS91637 represents professional-grade suspension engineering designed specifically for high-performance RC racing applications. The 12mm big bore shock system delivers superior performance characteristics compared to standard shock setups, with the larger bore diameter providing more effective damping and better heat dissipation during extended running sessions. The 54mm length specification is critical to maintaining proper ride height geometry and suspension travel, which directly impacts the vehicle's centre of gravity, weight transfer characteristics, and overall handling balance. The 4.45 lb spring rate sits in the medium range of the suspension tuning spectrum, making it suitable for a variety of track conditions and driving styles whilst maintaining excellent bump compliance and stability under acceleration and braking. The spring is constructed from high-quality steel alloy materials engineered to withstand the demanding loads experienced during competitive RC racing, including repeated compression cycles, high-speed impacts and extreme suspension articulation. This component is fully compatible with all Associated vehicles specified in the fitment list, including the RC10SC5M short course truck, RC10T4.2 touring buggy, and RC10T5M competition buggy, making it an essential upgrade for anyone running these popular competition vehicles. The engineering and manufacturing standards applied to this spring ensure consistent performance characteristics throughout its service life, critical for maintaining predictable handling and competitive lap times.
What's in the Box
- Associated 12MM Big Bore Spring, 54mm length, 4.45Lb rate, grey colour (AS91637)
Compatibility and Fitment
- Associated RC10SC5M Short Course Truck
- Associated RC10T4.2 Touring Buggy
- Associated RC10T5M Touring Buggy
- Associated RC10SC6.1 Short Course Truck
- Associated RC10SC6.2 Short Course Truck
- Associated T6.1 Touring Buggy
- Associated T6.2 Touring Buggy
- Associated Pro2 SC10 Short Course Truck
- Other Associated models with 12mm big bore shock compatibility
Frequently Asked Questions
- What is a big bore shock and why does it matter for my RC car? — Big bore shocks feature a larger diameter cylinder (12mm in this case) compared to standard shocks, which provides superior damping oil volume, better heat dissipation, more consistent performance throughout extended running sessions, and improved suspension compliance over rough terrain. For competitive RC racing in the UK, big bore shocks are the professional standard because they deliver more predictable and consistent handling characteristics lap after lap, which is essential for competitive success.
- How do I know if the 4.45Lb spring rate is right for my setup? — Spring rate selection depends on several factors including track surface (carpet versus concrete), driving style, vehicle weight, desired ride height and personal preference. The 4.45Lb rate is a medium-stiffness option suitable for most track conditions and driving styles. Many racers keep multiple spring rates on hand and swap them during testing to dial in the perfect setup. RC Model Shop staff can advise on spring rate selection based on your specific vehicle and racing conditions.
- Will this spring fit my Associated RC car? — The AS91637 is compatible with all Associated vehicles that feature 12mm big bore shock bodies, including the RC10SC5M, RC10T4.2, RC10T5M and many other Associated models. Check your vehicle's shock specifications before ordering, or contact RC Model Shop and our experienced team can confirm fitment for your specific model.
- How often should I replace my suspension springs? — Springs don't wear out like dampers do, but they can lose tension over extended use spanning months or years. If you notice your vehicle sitting lower than usual or handling inconsistently, spring replacement is a good maintenance step. Springs may also need replacement if they become bent or damaged through impacts or crashes.
- Is this a complete shock replacement or just the spring? — This is just the spring component. You'll need a complete 12mm big bore shock body, damper, piston and seals to assemble a full shock unit. If you need a complete shock assembly, RC Model Shop can advise on compatible options.
- Can I use different spring rates on the front and rear of my RC car? — Yes, and this is actually common practice in RC racing. Using slightly different spring rates front and rear allows you to fine-tune weight distribution, handling balance and turn-in characteristics to match specific track conditions and driving preferences. Professional racers often carry multiple spring rates for testing and tuning.
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 54MM GREY 4.45LB AS91637 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.
- Brand: Associated
- Part Number: AS91637
- Barcode: 784695916371
- Product Type: 12mm Big Bore Suspension Spring
- Spring Length: 54mm
- Spring Rate: 4.45 lb
- Bore Size: 12mm
- Colour: Grey
- Fitment Type: Standard
- Compatible Vehicles: RC10SC5M, RC10T4.2, RC10T5M and other Associated 12mm big bore shock vehicles
- Condition: New
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
- Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
- Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
- If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
- We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
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- If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
