Traxxas Front Springs Progressive -20% Rate Orange Pair TRX6861

Overview

The Traxxas Springs, Front (progressive, -20% rate, Orange) (2 pcs) TRX6861 are precision-engineered suspension components designed specifically for the Slash 4X4, one of the most popular 1/10 scale short course truck platforms in the RC car UK market. These custom-wound progressive-rate springs represent Traxxas's latest advancement in suspension tuning technology, allowing you to fine-tune your truck's handling characteristics with unprecedented precision. Whether you're competing at the track or bashing off-road, these springs unlock a new level of control and performance that goes beyond the factory-standard setup.

Spring rate is fundamental to how your RC truck performs across different terrains and driving conditions. The Traxxas progressive spring design is a sophisticated approach to suspension tuning that delivers small-bump compliance—meaning the suspension responds quickly and smoothly to minor impacts and track imperfections—without sacrificing the big-hit capability needed for jumps and aggressive terrain. This -20% rate variant (coloured orange for easy identification) sits 20% softer than the stock springs, making them ideal for drivers seeking improved ride comfort, enhanced traction on rough surfaces, and reduced harshness through bumpy sections. This makes them an excellent choice for UK bashers and racers who regularly encounter varied terrain conditions.

Available in pairs (two springs per pack), these front springs are colour-coded for simple identification and come with a durable powdercoated finish that resists chipping and fading. The white powdercoated finish guarantees lasting good looks, so your truck will look as impressive as it performs. If you're new to suspension tuning or looking to experiment with your Slash 4X4's setup, these springs are the perfect entry point into the world of precision chassis tuning.

Key Features

• Progressive-rate design — Unlike traditional linear springs that have a consistent rate throughout compression, progressive springs increase in stiffness as they compress further, allowing small bumps to compress the spring easily while large impacts benefit from progressive resistance that prevents bottoming out and protects the chassis.
• Custom-wound for Slash 4X4 — These springs are not generic suspension components; they are specifically engineered and wound to match the exact geometry and weight distribution of the Traxxas Slash 4X4, ensuring optimal performance characteristics and ride height when installed.
• -20% softer than stock rate — At 20% softer than factory specification, these orange-coded springs improve small-bump compliance and traction, making them particularly effective on rough terrain, bumpy outdoor tracks, and high-grip surfaces where suspension sensitivity is crucial.
• Colour-coded identification — The distinctive orange colour coding makes it instantly obvious which spring rate you have installed, eliminating confusion during setup changes and making it easy to maintain consistent tuning across multiple vehicles or when sharing equipment.
• Durable powdercoated finish — The white powdercoated finish protects the springs from corrosion, rust, and UV damage while maintaining a professional appearance, ensuring longevity even with frequent use and exposure to moisture from off-road driving.
• Sold in pairs — Each pack contains two front springs, giving you a complete left-and-right set ready for installation without purchasing multiple packs.
• Part of comprehensive tuning range — Traxxas offers these springs in four different rates (20% softer, 10% softer, 10% stiffer, and 20% stiffer than stock), allowing you to build a complete suspension tuning kit as your skills and preferences develop.

Technical Performance

Spring rate is measured in pounds per inch of compression—a fundamental principle of suspension engineering that determines how stiff or compliant a spring is. The Traxxas suspension tuning guide explains that a "4-pound" spring requires 4 pounds of force to compress one inch, and the greater the rate number, the stiffer the spring. Understanding spring rate is essential because it works in conjunction with shock damping to control oscillation—the natural tendency of a suspension to bob up and down repeatedly after absorbing an impact. When spring rate and damping force are properly matched, the suspension quickly compresses to absorb a jolt, extends to return to normal position, and resists further oscillation until the next bump arrives. These -20% rate springs are engineered to work within the Slash 4X4's suspension geometry to provide optimal performance in varied terrain. The progressive-rate design means that initial compression requires less force (improving small-bump sensitivity and ride quality), but as the spring compresses further, the rate increases progressively, providing progressive resistance that prevents excessive chassis squat and bottoming-out during aggressive driving. The white powdercoated finish provides both aesthetic appeal and protection against the elements, making these springs suitable for indoor carpet tracks, outdoor astro tracks, dirt circuits, and backyard bashing environments. Installation is straightforward and requires only basic tools and familiarity with your Slash 4X4's shock assembly. These springs are designed to work with Traxxas's factory shock absorber specifications and can be paired with various shock oils and piston configurations to achieve your desired handling balance.

What's in the Box

• 2 x Traxxas Springs, Front (progressive, -20% rate, orange)

Frequently Asked Questions

• What is a progressive spring and why is it better than a standard spring? — A progressive spring increases in stiffness as it compresses, providing two key benefits: the initial compression is soft and responsive (improving ride quality over small bumps and increasing traction), while the progressive resistance prevents bottoming-out and provides support during large impacts and aggressive driving. Traditional linear springs have a constant rate throughout their travel, meaning they're either too soft (causing bottoming-out) or too stiff (giving a harsh ride). Progressive springs give you both compliance and support in a single component.
• How do I know these are the right springs for my Slash 4X4? — These springs are custom-wound specifically for the Traxxas Slash 4X4 and are compatible with all standard Slash 4X4 models including the Slash VXL 4x4 RTR in all colour variants. The orange colour code indicates the -20% rate variant, making identification simple. These are front springs (sold as a pair), so you'll need separate rear springs to complete a full suspension upgrade.
• What does -20% rate mean and when should I use softer springs? — The -20% designation means these springs are 20% softer than the factory stock springs. Softer springs are ideal when you're experiencing a harsh ride on bumpy terrain, when you want improved small-bump compliance and traction, or when you're racing on rough outdoor tracks where suspension sensitivity is crucial. Softer springs allow the suspension to react more quickly to track imperfections, which can improve traction and ride quality, but they also increase body roll and make it easier to bottom-out if not paired with adequate damping.
• How do spring rate and damping work together? — Spring rate and damping force must be properly matched for optimal suspension performance. The spring absorbs energy and stores it, then releases it; the damper (which uses a piston moving through oil) prevents the spring from oscillating uncontrollably. If you increase damping significantly without changing springs, the springs may not compress quickly enough and the suspension will "pack up" and limit travel. Conversely, if your damping is too light, the suspension will bounce excessively. The Traxxas factory setup is always a good starting point, and any changes to spring rate should be considered alongside your shock damping settings and oil viscosity.
• Can I use these springs on other Traxxas models? — These springs are specifically custom-wound for the Slash 4X4 and are not recommended for other Traxxas models, as different chassis have different geometry, weight distribution, and suspension arm angles. Using springs designed for a different platform may result in poor handling, excessive ride height variation, or bottoming-out. Always use springs matched to your specific vehicle model.
• How does progressive spring rate affect my truck's handling? — Progressive springs provide a smoother initial response (improving comfort and traction over small bumps) while still providing support during aggressive driving. Because these springs are -20% softer than stock, your truck will have improved compliance and traction on bumpy terrain, but the progressive design ensures you won't lose support during big hits or jumps. This makes them particularly effective for rough outdoor tracks and varied terrain where suspension sensitivity is valued.
• What is spring preload and how do I adjust ride height? — Ride height is the distance between your chassis and the running surface when the truck is at rest. The springs must be compressed slightly (pre-loaded) to support the weight of the vehicle. To adjust ride height, you add spacers above the spring retainer or thread the spring retainer up or down the shock body. A common mistake is setting maximum ride height believing this provides the most suspension, but suspension must also have downtravel (allowing wheels to drop into potholes and dips). The optimal ride height is typically set near the middle of suspension travel, with front ride height often set 1-3mm lower than rear to improve steering response and prevent chassis lean under acceleration.
• Are these springs suitable for beginners? — Yes, absolutely. Spring tuning is one of the most accessible ways to improve your truck's performance, and these springs come with the benefit of being custom-wound for your specific model. Start with the factory setup, then experiment with different rates to find what works best for your driving style and local terrain. The -20% softer option is an excellent first upgrade if you're finding the stock springs too harsh or if you want improved traction on rough surfaces.
• How often should I replace these springs? — Springs don't wear out in the traditional sense, but they can lose performance over time due to heat cycling and compression set (permanent deformation). With regular use, most springs last several seasons. If you notice your truck's ride height gradually dropping or the suspension feeling less responsive, it may be time to replace them. Always inspect springs visually for cracks or permanent bending before each driving session.
• What tools do I need to install these springs? — Installation requires basic RC tools: a screwdriver (typically Phillips head), tweezers for handling small clips, and possibly a spring compressor tool to help remove the spring retainer safely. Most Traxxas shocks use clip-on spacers (for Ultra Shocks) or threaded bodies (for GTR shocks) for ride height adjustment. Your Slash 4X4 manual will provide detailed installation instructions.

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, Front (progressive, -20% rate, Orange) (2 pcs) TRX6861 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.