RPM ARRMA Big Rock Senton Granite 4x4 Front A-Arms Suspension Upgrade RPM81492

Overview

The RPM Arrma Front Arms for Big Rock 4x4 v2, Senton 4x4, Granite 4x4 and Vorteks 3S represent a significant upgrade for owners of these popular ARRMA 3S BLX brushless RC vehicles. Whether you're a weekend basher enjoying high-speed runs across the UK countryside, or a serious RC enthusiast looking to improve your truck's handling characteristics, these front A-arms deliver genuine performance benefits that transform how your vehicle behaves both on and off the track. As premium upgrade parts engineered by RPM, a brand renowned for suspension excellence in the RC car UK market, these A-arms answer the three questions every RC driver asks: can I get more adjustability? Can I improve durability? And can I reduce weight without sacrificing strength?

These front A-arms are direct replacements for the ARRMA stock part number AR330443, making installation straightforward for anyone familiar with basic RC maintenance. RPM has redesigned the suspension geometry while maintaining complete compatibility with your vehicle's stock suspension setup, meaning you get enhanced performance without needing to rebuild your entire chassis. The engineering-grade nylon construction ensures these parts will withstand the punishment of serious bashing, whether you're tackling rocky terrain, jumping over berms, or pushing your truck to its limits at high speed across varied surfaces.

What sets RPM apart in the ready to run RC and upgrade parts market is their commitment to genuine innovation. Rather than simply making parts tougher by adding material weight, RPM has engineered these A-arms to be simultaneously stronger, lighter, and more adjustable than the factory alternatives. This philosophy of intelligent design, combined with materials science expertise, is why serious RC enthusiasts across the UK choose RPM suspension components for their ARRMA vehicles.

Key Features

• Dual Shock Mount System — RPM has added a second shock mount hole positioned on the outside of the stock shock location to both the front and rear A-arms. This exclusive innovation gives you genuine adjustability options that simply don't exist on standard ARRMA suspension parts. By using the outer shock mount position, you can lower your vehicle's ride height, which increases stability across all surface types and dramatically improves cornering speeds, making your truck more planted and responsive through turns.
• Engineering-Grade Nylon Construction — Manufactured from RPM's trademark blend of indestructible engineering-grade nylon compounds, these A-arms are built to survive the crashes and impacts that come with aggressive RC bashing. The material composition provides superior impact resistance compared to standard plastic parts, meaning your suspension will maintain its integrity through countless hard landings and collision moments that would damage lesser components.
• Improved Trackability — The addition of the secondary shock mount position improves how your ARRMA truck tracks through corners and over uneven terrain. Better trackability means more predictable handling, easier steering input response, and improved overall vehicle control, whether you're racing competitively or simply enjoying backyard play with friends and family across the UK.
• Stock Geometry Retention — RPM has redesigned the A-arm shape to improve durability and survivability while retaining your vehicle's original suspension geometry. This means you won't need to recalibrate your suspension settings, adjust tracking, or make other compensatory changes when you install these parts. They simply bolt in and deliver improved performance immediately.
• Weight Reduction — Despite their superior strength and durability, these A-arms are lighter than stock ARRMA components thanks to intelligent material engineering and optimised design. Reducing unsprung weight improves suspension response, acceleration, and overall vehicle dynamics, giving you a noticeably more lively and responsive driving experience.
• Enhanced Crash Survivability — RPM has specifically redesigned the A-arm profile to improve survivability during impacts. Those inevitable "oops" moments when your truck collides with obstacles are handled better by these parts, as the shape distribution helps absorb and distribute impact forces more effectively than standard geometry.
• Direct OEM Replacement — These A-arms replace ARRMA part number AR330443, making them a straightforward bolt-on upgrade requiring no modifications to your vehicle's chassis, suspension links, or other components. If you can remove the old part, you can install the new ones in minutes.

Technical Performance

These RPM front A-arms represent cutting-edge suspension engineering for the 1/10 scale 4WD ARRMA platform. Constructed from advanced engineering-grade nylon, the material blend delivers exceptional durability without excessive weight penalty. The dual shock mount system is the standout technical feature, providing genuine adjustability that transforms how your truck handles across different terrain types and driving styles. By repositioning the shock mount to the outer hole, you effectively lower the vehicle's ride height, which increases chassis stability and allows faster cornering speeds whilst maintaining traction through technical sections. The suspension geometry has been meticulously redesigned to improve impact absorption during crashes, with the updated A-arm profile distributing impact forces across a wider area, reducing the likelihood of component failure during aggressive bashing sessions. For owners of ARRMA Big Rock 4x4 models (part number AR102711), Senton 4x4 variants (AR102668, AR102667, AR102678), and Granite 4x4 trucks (AR102665, AR102666, AR102676), these A-arms provide a direct performance upgrade that maintains complete compatibility with your vehicle's existing suspension linkages, driveshafts, and steering components. The lightweight construction maintains unsprung weight reduction benefits, improving suspension response time and overall vehicle agility. These parts are engineered to work with your existing 3S LiPo battery setup and brushless motor configuration, requiring no electrical modifications or additional components.

What's in the Box

• RPM Front A-arms for ARRMA Big Rock 4x4, Senton 4x4, Granite 4x4 and Vorteks 3S (compatible with 3S BLX versions)

What You Need to Complete

• ARRMA Big Rock 4x4 v2, Senton 4x4, Granite 4x4 or Vorteks 3S RC truck (3S BLX brushless models only)
• Basic RC tools including hex drivers to remove existing A-arms and install new components

Frequently Asked Questions

• Will these RPM front A-arms fit my ARRMA Big Rock 4x4? — These arms fit the Big Rock 4x4 v2 and certain Big Rock models that use Granite 4x4 style A-arms. However, some Big Rock versions use Typhon 3S style A-arms instead. It's essential to verify your stock ARRMA part number before purchasing. If your vehicle currently uses ARRMA part number AR330443, these RPM parts will be a direct replacement. If you're unsure, check your vehicle's documentation or contact our team at RC Model Shop for verification.
• What is the main advantage of the dual shock mount system? — The secondary shock mount hole positioned on the outside of the stock location allows you to adjust your vehicle's ride height by selecting which mounting point you use. Lower ride height increases stability and allows faster cornering speeds, whilst also improving traction through technical terrain. This single feature provides genuine adjustability that stock ARRMA suspension simply cannot offer.
• Are these A-arms suitable for high-speed bashing? — Yes, absolutely. RPM's engineering-grade nylon construction is specifically designed for aggressive RC driving. The improved impact survivability from the redesigned A-arm profile means these parts handle high-speed crashes and collisions significantly better than standard ARRMA components, making them ideal for weekend bashers and serious RC enthusiasts.
• Will I need to adjust my suspension geometry after installing these A-arms? — No. RPM has retained your vehicle's original suspension geometry in these updated parts, so installation requires no subsequent recalibration or adjustment. Simply remove your old A-arms and bolt these new ones in place.
• How much weight do these parts save? — While the exact weight savings aren't specified, RPM's intelligent engineering allows these stronger, more durable A-arms to be lighter than stock ARRMA parts through optimised material distribution and design. The weight reduction improves suspension response and overall vehicle agility.
• Do these A-arms work with the Big Rock v3? — No. These front A-arms are designed for Big Rock 4x4 v2 and earlier models. Big Rock v3 owners require the RPM80762 component specifically engineered for v3 geometry.
• Are these front A-arms sold as a pair or individually? — The product listing shows these as the front A-arms package. Confirm quantity with RC Model Shop to ensure you receive both left and right arms needed for complete front suspension upgrade.

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 Front Arms Big Rock 4x4 v2, Senton 4x4, Granite 4x4, Vorteks 3s RPM81492 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.