RPM Rear A-arms for Electric Traxxas Rustler Stampede 2WD Black RPM80182

Overview

The RPM Elec. Rustler/Stampede Rear Arms in Black (RPM80182) represent a significant upgrade for owners of the electric Traxxas Rustler and Stampede 2WD models. These precision-engineered rear A-arms deliver enhanced durability and strength compared to the stock components, whilst simultaneously achieving a remarkable weight reduction that transforms your RC car's handling and responsiveness. Whether you're a competitive racer or a weekend basher enjoying RC cars in the UK, upgrading to RPM suspension components is one of the most effective ways to improve your vehicle's performance without the complexity of a complete rebuild.

RPM has engineered these rear A-arms to be stronger and more durable than factory versions through careful material selection and design optimisation, yet they weigh just 7 grams each—that's an impressive 14 grams of total weight loss from a single pair of rear arms. This unsprung weight reduction directly translates to faster acceleration, quicker deceleration, and improved suspension response, giving your electric Rustler or Stampede a noticeable performance advantage on the track or trail. When combined with a matching set of RPM front A-arms, the total weight saving exceeds 24 grams—almost a full ounce—which is substantial for a 2WD RC vehicle and will make an immediate difference in how your car behaves through corners and over jumps.

Designed specifically for the 2WD electric versions of the Traxxas Rustler and Stampede, these A-arms are injection-moulded in premium black plastic and sold as a complete rear pair (one left rear and one right rear). RC enthusiasts across the UK have long recognised RPM as a brand synonymous with quality upgrades that offer genuine performance benefits without introducing reliability issues.

Key Features

• 7 Grams Lighter Per Arm — Each rear A-arm weighs 7 grams less than the stock Traxxas component, and since you receive a pair (left and right), you eliminate 14 grams of unsprung weight from your RC car's suspension system, which improves acceleration, braking response and overall handling dynamics.
• Enhanced Durability and Strength — Despite the significant weight reduction, RPM's engineering ensures these arms are actually stronger and more durable than factory parts, with no compromise in flex characteristics or structural integrity, meaning you get better performance without sacrificing reliability.
• Optimised Shock Mount Locations — RPM has carefully adjusted the shock mounting points to provide more noticeable tuning adjustments when selecting between inner and outer shock mount holes, whilst keeping the centre hole in its original position for stock setups, giving you greater suspension tuning flexibility.
• Dramatically Reduced Slop — The inner arm mount has been refined to eliminate over 0.030 inches (0.8mm) of slop, and the outer hinge pin area has been tightened to remove more than 0.010 inches of unwanted movement, resulting in an ultra-smooth, slop-free suspension system that responds precisely to your input.
• Fits 2WD Electric Models — These arms are designed specifically for the two-wheel-drive versions of the electric Traxxas Rustler and Traxxas Stampede, ensuring a perfect fit and proper suspension geometry with no modifications required.
• Multiple Colour Options — Available in black, blue, green, red or pink to match your personal style or team colours, allowing you to customise your RC car's appearance whilst upgrading performance.
• Sold as Matched Pair — Each package contains one left rear arm and one right rear arm, ready for installation with no additional components needed beyond basic tools.

Technical Performance

RPM's engineering approach to these rear A-arms demonstrates a deep understanding of RC suspension dynamics and the compromises that often exist in performance parts. Rather than simply removing material to save weight, RPM has redesigned the internal structure of the arms to maintain full strength whilst reducing mass, a process that requires sophisticated CAD modelling and extensive testing. The material selection and wall thickness have been optimised so that the arms are actually more durable than Traxxas factory parts—a claim backed by the genuine experiences of thousands of UK RC enthusiasts who have relied on RPM components for years. The weight reduction of 7 grams per arm might sound modest in isolation, but unsprung weight (weight not supported by the suspension springs) has an amplified effect on handling. By reducing unsprung mass, you improve the suspension's ability to follow track contours, enhance traction over varied terrain, and reduce the energy required to move the suspension, which translates directly into faster lap times and more responsive vehicle behaviour. The adjustment to shock mount locations is particularly clever—by spacing the inner and outer holes further apart in effective distance from the suspension axis, small changes in shock positioning produce more noticeable differences in suspension rate and ride height, giving you finer tuning control. The elimination of slop at critical joints is equally important for performance; the 0.030-inch reduction at the inner arm mount and 0.010-inch tightening at the outer hinge pin means the suspension geometry remains consistent throughout the travel range, preventing the subtle misalignments that cause unpredictable handling and tyre wear patterns. These precision improvements make RPM rear A-arms particularly valued by competitive RC racers in the UK who demand consistency and repeatability from their equipment.

What's in the Box

• 1x Left Rear A-arm (black)
• 1x Right Rear A-arm (black)

Compatibility and Installation

• Fits: 2WD electric Traxxas Rustler
• Fits: 2WD electric Traxxas Stampede
• Standard RC tools required for installation (Allen keys, screwdrivers)
• Compatible with matching RPM Front A-arms for maximum performance benefits

Frequently Asked Questions

• Will these rear arms fit my electric Traxxas Rustler or Stampede? — Yes, the RPM80182 is designed specifically for the 2WD electric versions of both the Traxxas Rustler and Traxxas Stampede. If you own a nitro-powered model or the 4WD variants, you will need different arms. Check your vehicle's specification to confirm it is the 2WD electric version before purchasing.
• How much lighter are these arms compared to stock Traxxas parts? — Each individual arm weighs 7 grams less than the stock component. Since you receive a pair (left and right rear), the total weight reduction is 14 grams for the rear suspension. If you also upgrade the front arms with matching RPM parts, the combined weight loss exceeds 24 grams, which is nearly a full ounce of unsprung weight removed from your RC car.
• Will lighter A-arms make my RC car faster? — Lighter arms improve acceleration, deceleration and suspension response rather than top speed directly. The unsprung weight reduction means your suspension can react more quickly to track variations, your tyres maintain better contact with the ground, and your vehicle accelerates and decelerates more quickly. For bashers, you'll notice the car feels more nimble and responsive; for racers, lighter A-arms typically translate into faster lap times through improved handling consistency.
• Are these arms as strong as the factory Traxxas parts? — RPM's engineering actually makes these arms stronger and more durable than stock Traxxas components, despite the weight saving. This is achieved through sophisticated design optimisation rather than simply removing material, and RPM backs this up with the genuine track record of their parts being trusted by RC enthusiasts and competitors across the UK.
• Can I adjust suspension tuning with these arms? — Yes, RPM has optimised the shock mount locations to provide more noticeable tuning adjustments when using the inner or outer shock mount holes. The centre hole remains in the stock position for users who prefer the standard setup. This gives you greater flexibility for fine-tuning your suspension characteristics.
• What is slop and why does reducing it matter? — Slop refers to unwanted movement or play in suspension joints. The RPM arms eliminate over 0.030 inches of slop at the inner arm mount and over 0.010 inches at the outer hinge pin, creating a tighter connection that prevents the subtle shifts in suspension geometry that cause unpredictable handling and uneven tyre wear. This means your suspension behaves consistently and predictably.
• Are these parts suitable for beginners? — Absolutely. RPM A-arms are a straightforward upgrade that requires only basic tools (Allen keys and screwdrivers) to install. Even a beginner can remove the stock arms and install the RPM versions in under 15 minutes. The parts simply bolt in where the factory arms attach, with no special knowledge required.
• What colours are available? — The RPM80182 specifically is the black version, but matching rear A-arms are also available in blue, green, red and pink. You can mix and match colours or keep everything uniform depending on your RC car's colour scheme.
• Can I use just the rear arms without upgrading the front? — Yes, the rear arms will deliver immediate benefits on their own. However, RPM recommends pairing them with matching front A-arms to realise the complete suspension upgrade, which delivers the full weight-saving advantage of over 24 grams total and ensures balanced suspension tuning across both axles.

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 RPM Elec. Rustler/Stampede Rear Arms - Black RPM80182 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.