Overview
The Fastrax Arrma Grom/Granite Aluminium Rear Upper Arms represent a significant performance upgrade for owners of Arrma 1/18 scale monster trucks. Whether you're a dedicated RC enthusiast in the UK looking to enhance your basher or a competitor seeking to optimise suspension geometry, these precision-engineered components deliver noticeable improvements in handling and durability. Aluminium construction offers a perfect balance between lightweight performance and long-lasting reliability, making these rear upper arms an essential upgrade for anyone serious about getting the most from their RC vehicle.
The Fastrax brand is renowned throughout the UK RC community for producing high-quality upgrade parts that directly improve performance on track and off-road. These rear upper arms are specifically engineered to fit Arrma's popular 1/18 Granite Grom platform, one of the most beloved brushed 4x4 monster trucks in its class. By upgrading from standard plastic components to full aluminium construction, you'll notice improved suspension response, better geometry under load, and enhanced durability during aggressive driving. This is the kind of tune-up option that separates weekend bashers from serious RC car enthusiasts who demand reliability and performance.
Supplied as a pair, these components are ready to install and will transform how your Arrma Grom or Granite handles during cornering, jumps, and sustained off-road driving. For anyone running a brushed 4x4 monster truck RTR in the UK or looking to build a competition-ready setup, these aluminium rear upper arms are a proven, trusted upgrade that delivers real-world benefits you'll feel immediately.
Key Features
- Aluminium Construction — Manufactured from high-grade aluminium alloy, these rear upper arms offer superior strength-to-weight ratio compared to plastic originals, reducing flex under hard cornering whilst keeping unsprung weight to a minimum for better suspension response and handling.
- Perfect Fitment — Precision-engineered to fit Arrma 1/18 Granite Grom models perfectly, including the MEGA 380 Brushed 4x4 variant, ensuring drop-in installation without modification or trial-fitting.
- Supplied as a Pair — Both rear upper arms included, so you have everything needed to complete a full rear suspension geometry upgrade without purchasing multiple parts separately.
- Enhanced Durability — Aluminium arms resist the cracking and stress fractures that plagued plastic components during aggressive off-road running, jumps, and high-impact driving conditions.
- Improved Suspension Geometry — The transition from plastic to aluminium maintains precise suspension angles and camber settings, resulting in more predictable handling and better tyre contact during cornering and acceleration.
- Lightweight Performance Upgrade — Unlike heavier steel alternatives, aluminium keeps your Arrma monster truck as light as possible whilst delivering genuine strength improvements that directly translate to faster lap times and more responsive handling.
- Professional-Grade Tune-Up — This is the type of suspension upgrade favoured by RC enthusiasts and competitors across the UK who understand that small improvements in suspension components add up to measurable performance gains.
Technical Performance
The Fastrax Arrma Grom/Granite Aluminium Rear Upper Arms represent precision engineering at its finest for 1/18 scale RC enthusiasts. Manufactured from premium-grade aluminium alloy, these components provide exceptional rigidity whilst maintaining a lightweight profile that won't compromise acceleration or overall vehicle responsiveness. The suspension geometry is maintained to exacting tolerances, ensuring that your Arrma monster truck's handling characteristics remain predictable and responsive whether you're running the standard MEGA 380 Brushed 4x4 configuration or a modified setup with upgraded electronics. Aluminium's inherent strength means these arms will withstand the repeated impacts, cornering loads, and suspension articulation demands that characterise both casual weekend bashing and competitive RC off-road driving. Installation is straightforward for anyone with basic RC maintenance experience, and the tight manufacturing tolerances ensure a perfect fit without any binding or play in the suspension system. For UK RC enthusiasts running Arrma's 1/18 Granite Grom platform, upgrading from the original plastic upper arms to these aluminium versions delivers noticeable improvements in cornering stability, jump landing control, and overall durability during extended driving sessions.
What's in the Box
- Fastrax Arrma Grom/Granite Aluminium Rear Upper Arms (pair)
Frequently Asked Questions
- Will these rear upper arms fit my Arrma 1/18 Granite Grom? — Yes, these Fastrax aluminium rear upper arms are specifically engineered for Arrma 1/18 Granite Grom models, including the popular MEGA 380 Brushed 4x4 variant. They fit all current colour variants including the red, blue/red, and green options.
- What's the benefit of upgrading to aluminium rear upper arms? — Aluminium provides superior strength compared to plastic whilst keeping weight down, resulting in improved suspension response, better handling during cornering, reduced flex under load, and enhanced durability during aggressive driving and jumping. You'll notice more predictable handling and fewer breakages.
- Are these suitable for beginners? — Whilst these are replacement parts rather than beginner-friendly ready-to-run vehicles, any RC enthusiast with basic mechanical knowledge can install them. If you're new to RC maintenance, consider asking an experienced friend or local RC shop to help with installation. The genuine benefit comes from having upgraded components that perform better under use.
- Do I need to replace the front upper arms as well? — Not necessarily, though many UK RC enthusiasts upgrade both front and rear suspension for consistent handling characteristics throughout the vehicle. Fastrax produces matching front upper arms if you decide to do a complete suspension upgrade.
- What's the difference between these aluminium arms and the standard plastic ones? — Stock plastic upper arms flex under cornering and impact loads, reducing precision and eventually cracking during hard use. These aluminium replacements eliminate flex, maintain consistent suspension geometry, and resist breakage during jumps and aggressive driving, translating to noticeably better handling and reliability.
- Will these arms work with my modified Arrma Grom? — These arms are engineered to the OEM specifications of Arrma 1/18 Granite Grom vehicles, so they'll work with most standard modifications. However, if you've made significant geometry changes or used other third-party suspension components, verify fitment with the manufacturer or your local RC shop.
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 FASTRAX ARRMA GROM/GRANITE ALUMINIUM REAR UPPER ARMS (PR) FTAR052BK 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.
- Brand: Fastrax
- Model Number: FTAR052BK
- EAN: 5056135785041
- Component Type: Rear Upper Arms
- Material: Aluminium
- Quantity Supplied: Pair (2 units)
- Compatible Vehicles: Arrma 1/18 Granite Grom MEGA 380 Brushed 4x4 Monster Truck RTR (all colour variants)
- Compatible Models: C-ARA2102T2 (Red), C-ARA2102T1 (Blue/Red), C-ARA2102T3 (Green)
- Classification: Suspension Tune-Up Option Part
- Stock Status: In Stock
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- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
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