RPM Blue Rear A-Arms for Traxxas Electric Stampede and Rustler 2WD RPM80185

Overview

The RPM Blue Rear A-Arms for Traxxas Electric Stampede or Rustler represent a significant upgrade from stock suspension components, delivering the rare combination of increased strength and dramatically reduced weight. These rear A-arms are engineered specifically for the 2WD versions of the electric Stampede and Rustler, making them an essential performance upgrade for RC enthusiasts across the UK looking to improve their vehicle's handling, responsiveness and durability. Whether you're racing competitively, bashing at the weekend, or simply looking to extract maximum performance from your RC car, these premium nylon composite arms will transform your suspension setup.

RPM has been recognised as a leader in aftermarket RC suspension components, and these rear A-arms exemplify their commitment to engineering excellence without compromise. Each pair delivers substantial weight savings alongside enhanced rigidity and precision—a combination that stock Traxxas components simply cannot match. If you're serious about getting the best performance from your 2WD electric Stampede or Rustler, upgrading to RPM suspension arms is one of the most impactful modifications you can make to your RC vehicle.

Available in an eye-catching blue colour finish, these arms are not just functionally superior but also add visual appeal to your RC truck setup. The precision engineering and attention to detail visible in every component demonstrate why serious RC enthusiasts across the UK consistently choose RPM upgrades for their competition and leisure builds.

Key Features

• 7 grams lighter per arm — Each RPM rear A-arm weighs 7 grams less than the stock Traxxas equivalent, which when paired eliminates 14 grams of unsprung weight from your vehicle, dramatically improving suspension response and overall handling characteristics without any loss of durability or structural integrity.
• Reduced suspension slop and play — These arms eliminate over 0.03 inches (0.8mm) of slop from the inner arm mount and more than 0.010 inches from the outer hinge pin, creating an ultra-smooth, slop-free suspension system that delivers superior precision and consistency on both track and terrain.
• Enhanced shock mount tunability — RPM engineers slightly revised the shock mount locations to provide more noticeable adjustment changes when using the inner or outer shock mount holes, whilst the centre shock mount remains in the stock location for easy setup transitions and compatibility with existing suspension geometry.
• No weak points or flex — Despite the substantial weight reduction, these A-arms maintain the stiffness and rigidity that racers demand, with no introduction of flex or weak points that could compromise performance or durability during aggressive driving.
• Massive weight savings when paired with front arms — Installing RPM front A-arms alongside these rear units delivers total weight loss exceeding 24 grams, or almost a full ounce, across the entire suspension system without sacrificing any durability.
• Ultra-durable nylon blend material — These A-arms are moulded from RPM's renowned ultra-durable nylon composite for long-lasting performance that exceeds standard plastic components in both durability and consistency.
• Sold in left and right pairs — Each package includes one left rear A-arm and one right rear A-arm, providing everything needed to upgrade the entire rear suspension with a single purchase.
• Available in multiple colours — These rear A-arms are moulded in blue, black, green, or red to match your vehicle's colour scheme or personal preference.

Technical Performance

The RPM rear A-arms for the electric Traxxas Rustler and Stampede represent a masterclass in precision engineering and performance optimization. Built from RPM's proprietary ultra-durable nylon blend, these components deliver measurable performance improvements across multiple parameters. The weight reduction of 7 grams per arm is achieved without introducing any weak points or compromising the structural rigidity that competitive RC drivers depend upon. The engineering challenge of reducing unsprung weight whilst maintaining or even improving stiffness demonstrates RPM's deep understanding of suspension dynamics. The slightly revised shock mount locations provide enhanced tuning capability, allowing drivers to make more noticeable adjustments to suspension geometry and handling characteristics by selecting different mounting points on the inner or outer shock positions. The centre shock mount position remains at the stock location, ensuring that transitioning from stock setups is straightforward and that proven baselines can be maintained. Most significantly, RPM engineers have eliminated substantial suspension play and slop at critical mounting points: over 0.030 inches (1/32 inch or 0.8mm) at the inner arm mount and more than 0.010 inches (just under 1/64 inch) at the outer hinge pin. This precision manufacturing creates a suspension system that responds predictably and consistently, with improved feel and feedback to the driver. The result is noticeably smoother suspension action, more precise steering response, and improved consistency whether you're pushing hard on a competition track or enjoying recreational bashing in the dirt. These components replace the stock Traxxas parts #3655 and #3655X, making installation straightforward on any 2WD electric Stampede or Rustler. The blue colour finish provides excellent visual contrast whilst standing the test of time under the rigours of outdoor RC driving.

What's in the Box

• 1 x Left rear A-arm (blue)
• 1 x Right rear A-arm (blue)

Frequently Asked Questions

• Will these RPM rear A-arms fit my Traxxas Stampede or Rustler? — These arms are specifically designed for the 2WD versions of the electric Stampede and Rustler only. They replace the stock Traxxas parts #3655 and #3655X. They will not work on nitro versions of these vehicles, so please verify you have an electric 2WD model before purchasing. If you're unsure about your vehicle's specifications, contact our expert team at RC Model Shop for confirmation.
• How much weight will I save by upgrading to RPM rear A-arms? — Each individual rear A-arm is 7 grams lighter than the stock Traxxas component. When installed as a pair, you'll eliminate 14 grams of unsprung weight from your vehicle's suspension. If you also upgrade to RPM front A-arms, your total weight savings across the entire suspension system will exceed 24 grams—nearly a full ounce. This reduction in unsprung weight directly translates to improved suspension response, faster chassis movements, and better overall handling characteristics.
• Will lighter A-arms make my suspension weaker or more flexible? — No. RPM engineers achieved the weight reduction without introducing any weak points or increasing flex. These A-arms maintain the same structural stiffness and rigidity as stock components whilst being significantly lighter. This is a key engineering achievement and a major reason why serious RC competitors across the UK choose RPM suspension upgrades over lighter but weaker alternatives.
• What suspension improvements will I notice after installing these A-arms? — You'll immediately notice a smoother, more responsive suspension system with significantly reduced play and slop. The improved precision at the mounting points eliminates the inconsistency and dead feel that develops in stock components over time. Steering response becomes more immediate, suspension geometry remains more consistent under load, and the overall driving experience becomes more predictable and enjoyable, whether you're racing competitively or bashing for fun.
• Can I adjust the shock mounting position on these A-arms? — Yes. RPM has provided slightly revised shock mount locations with an inner position, outer position, and centre position. The centre position matches the stock location for easy setup transitions. The inner and outer positions provide more noticeable adjustment changes than stock components, allowing you to fine-tune your suspension geometry and handling characteristics more effectively. This enhanced tunability is valuable for competition drivers who need to adapt their setup to different track conditions or driving styles.
• Will I need to replace any other parts when installing these rear A-arms? — These A-arms install as a direct replacement for stock Traxxas parts #3655 and #3655X and will work with your existing suspension components including shocks, shock mounts, and hinge pins. No additional parts are required for installation, though many users choose to upgrade to matching RPM front A-arms for consistent handling improvements across the entire suspension.
• What colour options are available for these rear A-arms? — These A-arms are moulded in multiple colour options including blue (this listing), black, green, and red. The blue colour provides excellent visual contrast and durability whilst maintaining the premium aesthetic that RPM products are known for.
• How do these A-arms compare to stock Traxxas suspension components? — These RPM A-arms offer significant advantages over stock components: 7 grams lighter weight per arm, elimination of suspension slop and play for improved precision, enhanced shock mount tunability, and ultra-durable nylon material that resists wear better than standard plastic. The combination of weight reduction, rigidity improvement, and precision engineering makes these components a must-have upgrade for any serious Stampede or Rustler owner in the UK RC community.

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 Blue Rear A-Arms For Traxxas Electric Stampede Or Rustler RPM80185 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.