Traxxas Shock Springs 139mm 0.39 Rate Progressive Orange Stripe TRX8154

Overview

The Traxxas Springs, shock, Long (natural finish) (GTS) (0.39 rate, Orange stripe) TRX8154 are premium progressive-rate suspension springs designed specifically for the TRX-4 Long Arm Lift Kit. These custom-wound springs represent genuine Traxxas engineering and are essential upgrades for RC enthusiasts looking to fine-tune their crawler's suspension performance. Whether you're a seasoned RC car UK competitor or a weekend basher exploring the capabilities of your TRX-4, these replacement springs offer the precision tuning that separates a good setup from a truly exceptional one.

Progressive-rate springs are custom-engineered to deliver responsive control over small bumps whilst progressively stiffening to absorb harder impacts, giving you the best of both worlds in variable terrain. The 0.39 rate on these Traxxas springs provides a softer suspension tune, making them ideal for vehicles running lighter configurations or for drivers who prefer a more compliant ride over rough ground. The natural finish construction ensures durability and longevity, whilst the distinctive orange stripe makes identifying your spring rate quick and easy in the workshop or at the track.

These springs come as a pair and are sold individually, allowing you to upgrade one axle at a time or build a complete suspension package by purchasing multiple sets. For anyone running a ready to run RC crawler or building a custom TRX-4 setup, Traxxas springs are the gold standard in aftermarket suspension tuning. Available now from RC Model Shop with fast UK delivery on orders over £99, these genuine Traxxas components ensure your investment in quality RC equipment is protected.

Key Features

• Progressive-Rate Design — These springs utilise a progressive-rate profile that provides a soft initial rate for sensitivity over small bumps and obstacles, then progressively stiffens to handle bigger impacts and maintain vehicle control during aggressive driving or full compression scenarios.
• 0.39 Spring Rate — The soft 0.39 rate makes these springs perfect for lighter vehicle builds, compensating for weight distribution on scaled-down crawlers, or for drivers who prefer a more responsive and compliant suspension feel that tracks terrain undulations naturally.
• Custom-Wound Construction — Each spring is precisely wound to Traxxas specifications, ensuring consistent performance, predictable handling characteristics and reliability that matches the engineering standards of your TRX-4 Long Arm Lift Kit.
• Natural Finish — The natural metal finish provides a clean, traditional appearance whilst offering excellent corrosion resistance. Unlike painted springs, the natural finish resists chipping and maintains its appearance through heavy use in muddy, wet or dusty conditions typical of UK RC basher sessions.
• Orange Stripe Identification — The bright orange stripe instantly identifies the spring rate, eliminating confusion when managing multiple sets of springs in your spares collection or during setup changes at the track.
• Sold as Pair — Each purchase includes two springs, allowing you to upgrade both sides of an axle simultaneously for balanced, predictable handling that won't cause unwanted vehicle lean or roll characteristics.
• TRX-4 Long Arm Lift Kit Specific — These springs are engineered specifically for the TRX-4 Long Arm Lift Kit geometry, ensuring correct mounting, proper articulation and optimised suspension travel for maximum crawling performance.
• Suspension Tuning Foundation — Spring rate selection is fundamental to suspension tuning in RC crawling. These 0.39 rate springs serve as an excellent baseline or alternative to stock springs, enabling you to dial in your setup for specific terrain types or driving styles.

Technical Performance

The TRX8154 springs are engineered using Traxxas's proven progressive spring technology, which has become the industry benchmark for RC crawler suspension tuning. The 0.39 rate specification indicates these are softer springs compared to heavier-rate alternatives, making them ideal for fine-tuning suspension geometry on the TRX-4 platform. The 139mm length (based on GTR progressive spring architecture) integrates seamlessly with the TRX-4 Long Arm Lift Kit's extended geometry, maintaining correct ride height, suspension travel and articulation angles essential for technical rock crawling, trail running and off-road exploration. The natural finish ensures these springs resist corrosion in wet UK weather conditions whilst the progressive winding profile delivers the responsive handling that separates Traxxas suspension components from generic alternatives. Built to withstand repeated cycles of compression and extension without permanent deformation, these springs maintain consistent performance over hundreds of hours of RC driving, whether on manicured track layouts or challenging natural terrain.

What's in the Box

• Traxxas Springs, shock, long (0.39 rate, orange stripe) x 2

Frequently Asked Questions

• Will the 0.39 rate springs work with my TRX-4 build? — These springs are specifically designed for the TRX-4 Long Arm Lift Kit, making them an excellent choice if you're running that upgrade. The 0.39 rate is a soft spring option, ideal if your vehicle is running lighter configuration or you prefer more compliant suspension feel. If you're unsure whether this rate matches your setup, contact our team at RC Model Shop and we'll help you select the correct spring rate for your specific TRX-4 build.
• What do progressive-rate springs do differently? — Progressive-rate springs deliver a dual-action suspension response: they're soft and responsive over small bumps and undulations, then progressively stiffen as they compress deeper, providing resistance during large impacts and full suspension travel scenarios. This means you get both sensitivity and stability without the compromise of a single-rate spring that's either too stiff everywhere or too soft to control large impacts.
• Why choose the 0.39 rate instead of heavier rates? — The 0.39 rate is the softest option in Traxxas's spring lineup, making it perfect for lighter vehicle configurations, smaller scales, or driving styles that prioritise controlled, responsive handling over terrain. If you're running a full-weight TRX-4 with heavy armour and accessories, you might benefit from a heavier rate. Our team can recommend the ideal spring rate for your exact setup.
• How many springs do I need to upgrade my suspension? — Each pair of springs covers one axle (front or rear). Most crawler builds benefit from a complete suspension upgrade, meaning you'll need two pairs: one for the front and one for the rear. Many UK RC enthusiasts also maintain spare sets so they can quickly swap rates for different terrain conditions or driving styles.
• Can I use these springs with other Traxxas models? — These springs are designed specifically for the TRX-4 Long Arm Lift Kit geometry. Whilst the spring itself might physically fit other Traxxas crawlers, using them outside their intended application could result in incorrect ride height, altered suspension geometry and poor handling. Always ensure spring selection matches your specific vehicle and kit specification.
• How do I know when my springs need replacing? — Springs rarely fail completely but do lose their progressive profile over thousands of compression cycles. If you notice your suspension feels less responsive over small bumps, wallows more during aggressive driving, or your vehicle's ride height has dropped, your springs may have fatigued and benefit from replacement. This is when new Traxxas springs restore that crisp, predictable suspension response.
• Are natural finish springs better than painted springs? — Natural finish springs offer practical advantages for serious RC enthusiasts. They resist paint chipping that occurs with painted springs during rough off-road use, they're easier to inspect for damage or stress marks, and they resist corrosion effectively in wet UK conditions. The clean aesthetic is also popular with builders who prefer a traditional workshop appearance.

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 Springs, shock, Long (natural finish) (GTS) (0.39 rate, Orange stripe) (for use with TRX-4 Long Arm Lift Kit) TRX8154 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.