Overview
The Traxxas Spring, shock, 139mm (natural finish) (GTR) (progressive, 1.146 rate, Green stripe) (2 pcs) TRX8442 is an essential suspension upgrade for RC enthusiasts across the UK who demand responsive handling and superior bump absorption. These progressive-rate springs are custom-wound to deliver the perfect balance between sensitivity and performance, making them an ideal choice for anyone looking to fine-tune their RC car's suspension setup. Whether you're a seasoned competitor at your local RC track, a weekend basher exploring UK countryside courses, or a dedicated hobbyist perfecting your ready to run RC vehicle, these GTR shock springs offer the tuning flexibility you need to optimise your vehicle's performance across different driving conditions.
Traxxas springs are renowned throughout the RC community for their precision engineering and reliability. The GTR spring range is specifically designed to work with 139mm shock absorbers, offering different rates to suit various vehicle configurations and driving styles. By investing in quality suspension components like these springs, you're taking control of your RC car's handling characteristics and ensuring your vehicle responds predictably to track conditions, whether you're navigating tight corners or powering through rough terrain on UK RC tracks.
These springs represent genuine Traxxas engineering, backed by the manufacturer's reputation for quality and performance. At RC Model Shop, we stock only authentic Traxxas products, ensuring you receive genuine components that will deliver the performance and durability you expect from one of the world's leading RC manufacturers.
Key Features
- Progressive-Rate Design — These springs are engineered with a progressive rate that provides responsive control for small bumps whilst progressively stiffening to absorb harder impacts, giving your RC vehicle excellent handling across a range of driving conditions from gentle cruising to aggressive bashing.
- 1.146-Rate Spring Constant — The specific spring rate is colour-coded with a green stripe for easy identification, allowing you to quickly match springs to your setup and compare rates when tuning your suspension system.
- 139mm Length — Specifically designed for GTR shock absorbers, these springs deliver optimal compression and extension characteristics that work in perfect harmony with your vehicle's suspension geometry.
- Natural Finish — The bare metal finish not only provides a clean, professional appearance but also allows you to see the spring construction clearly, making maintenance and inspection straightforward.
- Sold in Pairs — Two springs per package means you have everything needed for one complete shock upgrade, with matching rate consistency across both sides of your RC car's suspension.
- Suspension Tuning Flexibility — GTR springs are offered in multiple rates, allowing you to compensate for lighter or heavier vehicle configurations, fine-tune your suspension for specific driving conditions, or adjust responsiveness to match your driving style.
- Custom-Wound Quality — Each spring is custom-wound to Traxxas specifications, ensuring consistent performance and reliability that you can count on lap after lap, whether on track or off-road.
Technical Performance
The Traxxas GTR springs represent precision suspension engineering designed to meet the demanding requirements of serious RC car enthusiasts across the UK. These 139mm progressive-rate springs are manufactured with careful attention to detail, using high-quality materials selected for consistent performance and longevity. The 1.146 spring rate provides an optimal balance between suspension sensitivity and load capacity, making these springs suitable for a wide range of vehicle weights and driving styles. The progressive-rate design means the spring starts with a softer initial rate for small bumps, providing excellent bump absorption and traction over rippled surfaces, whilst progressively stiffening as the suspension compresses further, preventing bottoming out during hard impacts and maintaining control during aggressive driving. This engineering approach is fundamental to modern RC suspension design and reflects Traxxas's commitment to delivering vehicles and components that perform at the highest level. The natural finish allows the springs to be used immediately upon receipt and provides excellent visibility for inspection and maintenance throughout their service life.
What's in the Box
- Two 139mm GTR Progressive-Rate Shock Springs (1.146-rate, green stripe, natural finish)
Frequently Asked Questions
- What is a progressive-rate spring and why is it better for RC cars? — A progressive-rate spring starts with a softer rate, providing excellent sensitivity and compliance over small bumps, but progressively stiffens as it compresses further. This design delivers responsive handling for everyday driving whilst preventing suspension bottoming during hard impacts, making your RC car more predictable and easier to control across varying terrain.
- How do I know which spring rate I need for my RC car? — Spring rate is selected based on your vehicle's weight, driving style, and track conditions. Higher rates are firmer and suit heavier vehicles or aggressive driving, whilst lower rates are softer and better for lighter vehicles or sensitive handling. The 1.146 rate in this package is a popular general-purpose rate suitable for many standard RC vehicles. Consult your vehicle's manual or contact RC specialists for specific recommendations for your model.
- Are these springs compatible with my Traxxas vehicle? — These springs are specifically designed for GTR shock absorbers with a 139mm length. They are compatible with many Traxxas models including the Slash, Stampede, Rustler, Bandit and similar vehicles that use GTR shocks. Always verify your vehicle uses 139mm GTR shocks before purchasing to ensure proper fit and performance.
- What is the difference between spring rates and how do I choose the right one? — Traxxas offers GTR springs in multiple rates, each colour-coded for easy identification. Higher rates (stiffer springs) are numbered with higher values and suit heavier vehicles, whilst lower rates (softer springs) provide more compliance. The green stripe on this 1.146-rate spring makes it easy to identify. Experimenting with different rates is how serious RC racers fine-tune their suspension for specific conditions.
- How often should I replace my shock springs? — Quality springs like these Traxxas GTR springs typically last for hundreds of running hours with proper maintenance. Replace them if they lose their original shape, become visibly damaged, or if you notice your suspension no longer responds as it should. Regular inspection during maintenance checks will help you identify when replacement is necessary.
- Can I use these springs on different vehicles? — These springs are designed for 139mm GTR shocks, so they will work on any Traxxas vehicle (or compatible non-Traxxas vehicle) that uses this specific shock size. However, you should verify compatibility with your specific model to ensure proper fit and optimal performance.
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 Spring, shock, 139mm (natural finish) (GTR) (progressive, 1.146 rate, Green stripe) (2 pcs) TRX8442 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: Traxxas
- Model Number: TRX8442
- EAN: 020334844200
- Product Type: Shock Spring
- Spring Length: 139mm
- Spring Rate: 1.146-rate
- Spring Rate Colour Code: Green stripe
- Rate Type: Progressive-rate
- Finish: Natural (bare metal)
- Compatibility: GTR shock absorbers
- Quantity per Package: 2 springs (sold in pairs)
- Spring Material: Custom-wound precision steel
- Application: Suspension tuning and adjustment
- Features: Responsive control for small bumps with progressive stiffening for harder impacts
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.
- As soon as your order is on its way we will send you a tracking number by email. If you provide your mobile number at checkout we will also send delivery updates straight to your phone so you can keep an eye on progress.
- 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.
