RPM ARRMA Upper Lower Left Front A-Arms Black 6S Suspension Parts RPM81572

Overview

The RPM Arrma Upper/Lower Left Front Arms Black (RPM81572) represent a premium upgrade for your ARRMA 6S monster truck or stunt truck. Whether you're running an ARRMA Kraton, Notorious, Talion, Fireteam or Outcast, these heavy-duty A-arms deliver the durability and performance you need for serious bashing and racing. RPM has engineered these arms specifically for V5 and EXB editions, incorporating design modifications that make them the perfect replacement for tired or damaged original suspension components. If you're looking to upgrade your RC car UK setup with suspension parts that won't let you down when conditions get tough, these are the A-arms that serious enthusiasts choose.

RPM is recognised globally for producing some of the toughest, most reliable suspension components in the RC hobby. These left front A-arms are no exception. They're moulded from engineering-grade nylons that deliver exceptional strength and durability, meaning you'll spend more time driving and less time making repairs. The beefier construction throughout both upper and lower arms ensures your suspension performs predictably lap after lap, bash after bash.

This is a single package containing one upper A-arm and one lower A-arm (left side), meaning you'll need a matching right-side package to complete your vehicle's front suspension upgrade. When paired with the right-side equivalent, you'll have a transformed suspension system that handles corners faster, responds more precisely to terrain changes, and shrugs off impacts that would damage standard plastic arms.

Key Features

• Significantly Beefier Construction — The lower A-arm support beams are 30% thicker than the original 6S version, while upper A-arms are more than 22% thicker, delivering substantially improved durability and strength that translates directly to longer component life and fewer mid-session breakages.
• Reduced Flex for Better Handling — The added thickness throughout the arms reduces unwanted flex, which means more predictable suspension performance and handling characteristics that allow you to drive with confidence, particularly in high-speed cornering and aggressive terrain.
• Extra Suspension Tuning Options — The lower A-arm features an additional shock mount hole positioned further outboard, providing advanced suspension geometricians with a lower profile set-up option that allows shocks to lay down further, dropping your ride height and lowering the centre of gravity for higher corner speeds.
• Caster Spacer Elimination Design — The upper A-arm eliminates traditional caster spacers and instead features widened inner hinge pin mounts that create a more pronounced "A" shape, dramatically stabilising the upper A-arm and improving both steering response and suspension performance whilst adding structural strength.
• Engineering-Grade Nylon Material — These A-arms are moulded from RPM's nearly indestructible blend of engineering-grade nylons, delivering the toughness and reliability needed when you're pushing your ready to run RC buggy or truck to its limits in demanding conditions.
• V5 and EXB Model Compatibility — These arms are stock replacement parts for ARRMA parts #330655 (upper) and #330656 (lower), making them perfect direct replacements for V5 and EXB editions whilst maintaining reverse compatibility with older model generations.

Technical Performance

RPM has invested considerable engineering effort into these A-arms, and the results speak for themselves. The suspension geometry and material selection ensure that your ARRMA 6S brushless RC car maintains consistent handling characteristics whether you're pushing flat-out on a track or bashing through rough off-road terrain. The thicker support beams and wider hinge pin mounts work together to eliminate the flex that causes vague steering input and unpredictable handling, delivering a more connected driving experience. The additional shock mount position on the lower arm opens up serious tuning possibilities for drivers who want to dial in their suspension geometry for specific track conditions or driving styles. The engineering-grade nylon material offers genuine durability advantages over standard plastic, resisting impact damage that would crack or splinter inferior components. These are the kind of suspension upgrades that professionals and serious hobbyists choose when they want their ARRMA Kraton, Notorious, Talion, Fireteam or Outcast to perform at its absolute best. Whether you're a weekend basher who values reliability or a competitive racer chasing lap time improvements, these A-arms deliver measurable performance gains and the peace of mind that comes with industry-leading build quality.

What's in the Box

• One upper A-arm (left front)
• One lower A-arm (left front)

What You Need to Complete

• Right front A-arms package (sold separately) to complete the front suspension upgrade
• Standard RC car maintenance tools for installation

Frequently Asked Questions

• Are these RPM A-arms compatible with my ARRMA 6S RC monster truck? — Yes, the RPM81572 is specifically designed as a direct replacement for ARRMA parts #330655 (upper arm) and #330656 (lower arm). These fit V5 and EXB editions of the Kraton, Notorious, Talion, Fireteam and Outcast. They are also reverse compatible with older model generations, so even if you have an earlier version, these arms should fit. However, for absolute compatibility confirmation with your specific model year, we recommend contacting the RC Model Shop team before ordering.
• How much thicker and stronger are these compared to standard ARRMA A-arms? — RPM has engineered these arms to be significantly beefier than the original 6S version. The lower A-arm support beams are 30% thicker, whilst the upper A-arms are more than 22% thicker. This increased material thickness directly improves durability and strength, reduces flex for more predictable handling, and delivers longer component lifespan before wear or damage occurs.
• What material are these A-arms made from? — These A-arms are moulded from RPM's engineering-grade nylon blend, a nearly indestructible plastic compound specifically chosen for its superior impact resistance, flexibility and durability compared to standard plastic. This material is designed to withstand the punishment of RC racing and bashing.
• Do I need to buy anything else to complete my suspension upgrade? — This package contains only the left front A-arms. To complete your front suspension upgrade, you'll also need a matching right front A-arms package (also available from RC Model Shop). Once you have both left and right packages, your front suspension will be fully upgraded. You may also want to review your shock mounting positions to take advantage of the new additional shock mount hole on the lower arm.
• What advantage does the extra shock mount hole provide? — The additional shock mount hole on the lower A-arm is positioned further outboard and allows for a lower profile suspension set-up where the shocks can lay down further. This drops your overall ride height and lowers your centre of gravity, which translates to higher corner speeds and better stability in fast cornering.
• How does eliminating the caster spacers improve performance? — By removing traditional caster spacers, RPM was able to widen the inner hinge pin mount on the upper A-arm, creating a more pronounced "A" shape. This wider geometry stabilises the upper A-arm significantly, which improves steering response, suspension performance and adds structural strength and durability to the component.
• Will upgrading to these A-arms make my ARRMA truck faster? — These arms won't directly increase top speed, but they will improve handling precision and allow you to carry higher corner speeds thanks to better suspension geometry and reduced flex. The improved predictability and stability mean you can trust your truck in tight corners and rough terrain, allowing you to drive faster with confidence.

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 Left Front Arms Black 6S RPM81572 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.