RPM ARRMA A-Arm Suspension Component Right Front 1/8 Scale Black RPM81602

Overview

The RPM Arrma Upper/Lower Right Front Arm in black is a precision-engineered suspension component specifically designed for the 1/8 scale ARRMA Kraton, Notorious, Talion, Fireteam and Outcast 6S models. Whether you're a dedicated RC enthusiast in the UK looking to upgrade your monster truck's handling or a serious basher wanting to improve suspension performance, these front A-arms deliver noticeable improvements in durability, strength and predictable handling characteristics. RPM has engineered these components to work seamlessly with V5 and EXB editions of ARRMA vehicles, whilst maintaining reverse compatibility with earlier model generations, making them an excellent choice for upgrading older ready-to-run RC cars.

What sets these A-arms apart from standard stock components is RPM's commitment to performance refinement. The engineering team at RPM has incorporated significant structural improvements that translate into real-world benefits when you're pushing your brushless 6S RC truck to its limits. From the moment you bolt these arms onto your ARRMA, you'll notice improved suspension response, more precise steering feedback and a noticeably stiffer platform that reduces unwanted flex during aggressive driving. These aren't just bolt-on parts — they're a genuine upgrade that serious RC car UK enthusiasts trust for racing and bashing alike.

Each package contains one upper and one lower A-arm, meaning you'll need to purchase a matching left-side set to complete your front suspension upgrade. Constructed from RPM's nearly indestructible engineering-grade nylon blend, these arms are built to withstand the punishment of high-speed running, jumps, crashes and rough terrain that comes with owning a 6S monster truck.

Key Features

• Significantly Beefier Construction — The lower A-arm support beams are 30% thicker than the original RPM 6S version, whilst upper A-arms are more than 22% thicker, resulting in substantially improved durability and strength that directly translates to reduced flex during aggressive cornering and suspension articulation.
• Less Flex Equals Better Handling — The added thickness throughout the arm structure means less unwanted flexing during hard driving, which creates more predictable suspension performance, better handling consistency and more accurate camber, caster and toe angle settings that remain stable lap after lap.
• Slop Elimination — RPM A-arms reduce the amount of movement at the inner hinge pin mounts, providing superior steering response and ensuring your suspension geometry stays true to your setup specifications rather than wandering due to worn or loose connections.
• Extra Suspension Tuning Options — The lower A-arm features an additional shock mount hole positioned further outboard on the arm, allowing you to select a lower profile suspension setup where shocks can lay down at a more relaxed angle, effectively dropping ride height and lowering your vehicle's centre of gravity for improved cornering speeds.
• Caster Clip Elimination Design — The upper A-arm eliminates traditional caster spacers and compensates by widening the arm at the inner hinge pin mount, creating a more pronounced A-shape that stabilizes the upper arm, improves steering and suspension performance whilst adding inherent strength and durability to the component.
• Chamfered Leading and Trailing Edges — Machined 30° chamfered edges on both leading and trailing surfaces provide smoother transitions when your vehicle encounters obstacles too tall for the suspension to clear, whilst also offering improved aerodynamic characteristics compared to stock arms.
• Weight Reduction — These A-arms weigh approximately 59.5 grams compared to 66 grams for stock ARRMA components, providing roughly 10% weight savings that improve acceleration and overall power delivery whilst marginally lowering your vehicle's centre of gravity.
• Engineering-Grade Nylon Material — Constructed from RPM's proven blend of nearly indestructible engineering-grade nylons, these arms provide performance you can rely on in the worst conditions — whether you're bashing in wet weather, racing on abrasive tracks or pushing hard in competitive environments.
• Direct Stock Part Replacement — These A-arms directly replace ARRMA stock components #AR330218 (upper arm) and #AR330219 (lower arm) for the original 6S models, and #330655 (upper) and #330656 (lower) for V5 and EXB versions, making installation straightforward for anyone comfortable with basic RC maintenance.
• Cross-Platform Compatibility — Beyond ARRMA vehicles, these A-arms also fit the Durango DEX8T, providing upgrade options for users of that platform seeking improved suspension performance and durability characteristics.

Technical Performance

From an engineering perspective, these RPM A-arms represent a significant step forward in suspension component design for 1/8 scale bashers and racers. The decision to increase wall thickness by 30% on lower support beams and 22% on upper arms wasn't arbitrary — it directly addresses the real-world stresses these components endure during high-speed running with brushless 6S LiPo power systems. Modern ARRMA 6S vehicles are genuinely fast machines, and the suspension components must handle the resulting forces without deflecting or wearing prematurely. By eliminating traditional caster clip spacers and instead widening the upper arm's inner hinge pin mount area, RPM engineers have created a stiffer, more stable platform whilst actually improving the arm's load-bearing characteristics. The addition of a second shock mount position on the lower arm demonstrates thoughtful tuning flexibility — competitive RC enthusiasts know that suspension geometry directly impacts handling behaviour, and having multiple mounting options allows precise fine-tuning of ride height and suspension travel characteristics. The 30° chamfered edges aren't just aesthetic refinements; they serve a genuine functional purpose by smoothing the transition over tall obstacles whilst reducing weight concentration at the edges. Built from engineering-grade nylon rather than standard plastic, these arms withstand the punishment that brushless 6S power delivers, maintaining their structural integrity through countless hard landings, high-speed cornering sessions and general bashers' abuse. The weight savings of approximately 6.5 grams per arm compared to stock components represents meaningful mass reduction in a location that affects both acceleration response and suspension performance — every gram counts when you're running a speed monster truck.

What's in the Box

• RPM Upper A-arm (1)
• RPM Lower A-arm (1)

What You Need to Complete

• Matching left-side A-arm set (RPM part number for left front arm) to complete your front suspension
• Basic RC tools for removal and installation of the stock arms

Frequently Asked Questions

• Will these RPM A-arms fit my ARRMA Kraton or Outcast? — Yes, these A-arms are specifically designed for 1/8 scale ARRMA 6S models including the Kraton, Notorious, Talion, Fireteam and Outcast in both V5 and EXB versions. They also work with earlier model generations thanks to reverse compatibility. If you own a Durango DEX8T, these arms are compatible with that platform as well. Simply confirm your vehicle is a 6S model and you'll be ready to upgrade your suspension.
• Do I need to buy one or two sets of these A-arms? — This product contains one upper and one lower arm for the right side of your vehicle only. You'll need to purchase a matching left-side set separately to complete your front suspension upgrade. After purchasing both left and right sets, you'll have a fully upgraded front suspension with improved handling and durability.
• How much improvement will I notice in handling after installing these? — The improvements are genuinely noticeable. The primary benefits come from reduced flex — the 30% thicker lower support beams and 22% thicker upper arms mean your suspension responds more predictably to inputs, your steering feedback becomes sharper, and your vehicle maintains more consistent suspension geometry during hard cornering. You'll also appreciate the lower centre of gravity option with the extra shock mount hole on the lower arm, which helps your 6S monster truck maintain higher cornering speeds. Combined, these factors create noticeably tighter, more controlled handling characteristics.
• Are these A-arms suitable for beginners in the UK RC hobby? — These are suspension tuning components rather than beginner parts, but they're not difficult to install if you're comfortable removing and refitting stock arms. If you're relatively new to the hobby and your vehicle is still running standard arms, these represent an excellent first upgrade to experience how component quality directly impacts handling. However, you should ensure you're comfortable performing basic suspension maintenance before purchasing.
• What's the difference between these arms and the stock ARRMA components? — Stock ARRMA arms are adequate but exhibit measurable flex under load, resulting in less precise handling and inconsistent suspension geometry settings. RPM's engineering-grade nylon construction combined with significantly increased wall thickness (30% thicker on lower arms, 22% on upper arms) reduces flex substantially, providing more predictable performance. The added shock mount position on the lower arm wasn't on stock components, giving you additional tuning flexibility. Additionally, the slop elimination at inner hinge pin mounts ensures more accurate steering response compared to stock arms that have more play in their mounts.
• Can I use just the right-side arm without purchasing the left-side? — Technically you could replace only one side, but you wouldn't experience the full benefits of the upgrade. RPM recommends upgrading both sides for consistent handling across your vehicle's front end. A matching pair ensures symmetrical suspension behaviour and equal responsiveness on both sides of your truck.
• What material are these arms made from? — These A-arms are constructed from RPM's nearly indestructible engineering-grade nylon blend, which is significantly more durable than standard plastic. This material choice provides excellent strength-to-weight characteristics and maintains structural integrity through multiple hard impacts, jumps and crashes that come with running a 6S brushless monster truck.
• Will upgrading to these A-arms require any other suspension modifications? — No, these arms are direct replacements for stock components and bolt in using existing mounting points. Your suspension geometry, shock mounts and other components will work with these upgraded arms without modification. However, once installed, you may want to re-check and potentially adjust your camber, caster and toe settings to take advantage of the improved consistency these arms provide.

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 Arrma Upper/lower Right Fr Arm Black 6s Kraton/Outcast/Fireteam RPM81602 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.