RPM Rear A-Arms for 4S V2 ARRMA Kraton and Outcast Suspension Upgrade 81792

Overview

The RPM Rear A-Arms for 4S V2 ARRMA Kraton and Outcast represent a significant upgrade for anyone serious about maximising the performance and longevity of their RC monster truck or stunt truck. Designed with strength and durability as the primary focus, these replacement A-arms bring several engineering improvements that directly enhance throttle response, handling consistency and component lifespan. Whether you're a weekend basher enjoying your RC car UK experience or a dedicated enthusiast pushing your ARRMA to its limits, these A-arms deliver the robust performance that separates quality aftermarket parts from stock components.

RPM has engineered these rear A-arms specifically for the 4S V2 versions of the ARRMA Kraton and ARRMA Outcast, ensuring perfect fitment and compatibility. The A-arms replace the stock ARRMA part number ARA330710, and they're sold as a pair ready for installation. This is a suspension upgrade that makes a real difference in how your brushless RC truck behaves on the track or in the garden, offering a compelling alternative to stock suspension geometry for drivers looking to get more from their ready to run RC investment.

RPM's commitment to engineering excellence is evident throughout these A-arms. They're constructed from an ultra-tough blend of engineering-grade nylons that are moulded to be massive and uniform in thickness across their entire length. This uniform construction approach eliminates weak points and delivers the kind of durability that RC enthusiasts demand. Pair these with the optional RPM Rear Mud Guards for complete suspension protection, and you've got a suspension system built to withstand serious bashing.

Key Features

• Reduced Hinge Pin Movement — The A-arms are engineered to reduce the amount of movement at the hinge pins compared to stock components, which directly tightens the suspension feel and improves handling precision during acceleration and cornering.
• Better Throttle Response — By reducing play in the suspension geometry, you'll experience noticeably sharper and more predictable throttle response, making your RC truck feel more connected and easier to control at higher speeds.
• Consistent Camber and Toe Settings — The tighter tolerances mean your suspension geometry stays where you set it, maintaining consistent camber and toe angles throughout your driving session without unwanted geometry changes.
• Third Shock Mount Hole — An additional shock mounting position is centred between the two stock mounting holes, giving you a versatile mid-point option that lets you tune your suspension stiffness without committing to the extreme settings of the stock holes.
• Uniform Thickness Construction — Unlike some A-arms that vary in wall thickness, these are moulded with massive, uniform thickness across their entire length, eliminating weak points and stress concentrations.
• Ultra-Tough Engineering-Grade Nylon — Constructed from RPM's proven engineering blend of high-strength nylon compounds, these A-arms deliver the kind of durability you need for serious bashing and racing without the weight penalty of alternative materials.
• Lightweight Design — Despite their robust construction, these A-arms remain light enough not to negatively impact your truck's overall weight distribution or performance characteristics.

Technical Performance

The RPM Rear A-Arms for 4S V2 ARRMA Kraton and Outcast are engineered with precision tolerances that make them a measurable upgrade over stock suspension components. The engineering-grade nylon material used in their construction offers an exceptional strength-to-weight ratio, providing the rigidity needed for consistent performance without adding unnecessary mass to your RC vehicle. The uniform thickness throughout the arm design eliminates the weak points often found in suspension components, ensuring that force is distributed evenly across the entire structure. This design philosophy extends the service life of the A-arms significantly, reducing the frequency of suspension repairs and replacements. The reduction in hinge pin movement improves the overall torsional stiffness of the rear suspension geometry, which translates directly into more predictable handling characteristics and improved camber stability during high-speed manoeuvres. For drivers running their 4S LiPo-powered ARRMA brushless RC trucks, this level of suspension precision makes the difference between a truck that feels slightly loose and unpredictable versus one that feels planted and responsive. The addition of the third shock mounting option provides genuine tuning flexibility without requiring part swaps, allowing you to dial in the perfect suspension compliance for your specific driving style and track conditions.

What's in the Box

• RPM Rear A-Arms for 4S V2 ARRMA Kraton and Outcast (pair)
• Mounting hardware

Frequently Asked Questions

• Will these RPM A-arms fit my ARRMA Kraton or Outcast 4S V2? — Yes, these A-arms are specifically designed for the 4S V2 versions of both the ARRMA Kraton and ARRMA Outcast and replace the stock part number ARA330710. They're sold as a pair and include all necessary mounting hardware for installation.
• What is the difference between these RPM A-arms and the stock ARRMA A-arms? — The main improvements are reduced movement at the hinge pins for tighter handling, the addition of a third shock mount hole for more tuning options, and a more durable design with uniform thickness throughout. Stock ARRMA A-arms lack these features and are more prone to wear.
• Do these A-arms really improve throttle response? — Yes, by tightening up the hinge pin tolerances and reducing flex in the suspension geometry, you'll notice sharper and more consistent throttle response, especially when accelerating out of corners or over rough terrain.
• Can I use these with the optional RPM Mud Guards? — Absolutely. The RPM Rear Mud Guards (part number 81962) are specifically designed to fit these A-arms and will help protect your suspension and drivetrain components from mud and debris buildup.
• Are these A-arms suitable for beginners? — These are an intermediate to advanced upgrade. Beginners can certainly install them, but you'll get the most benefit if you have some experience tuning and adjusting your RC truck's suspension geometry. Installation is straightforward as they simply replace the stock A-arms.
• How much do these A-arms weigh? — The A-arms themselves are designed to be lightweight whilst maintaining strength. For comparison, the optional Mud Guards weigh just 8.5g each, showing RPM's focus on weight-conscious design.
• What materials are used in these A-arms? — These A-arms are moulded from RPM's ultra-tough engineering-grade nylon blend, the same proven material used across their entire suspension component range.

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 Rear A-Arms for 4s V2 Arrma Kraton and Outcast 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.