Fastrax Arrma Grom Granite Aluminium Rear Lower Arms Pair FTAR053R

Overview

The Fastrax Arrma Grom/Granite Aluminium Rear Lower Arms (PR) FTAR053R is a premium suspension upgrade designed specifically for your Arrma 1/18 scale RC monster truck. Whether you're a weekend basher enjoying RC car fun across the UK or a dedicated enthusiast looking to enhance your vehicle's performance, these rear lower arms deliver the durability and precision engineering that serious RC drivers demand. Built from high-quality aluminium, these components are engineered to withstand the rigours of off-road driving whilst providing superior handling characteristics compared to standard plastic alternatives.

These rear lower arms are an essential tune-up option for anyone running an Arrma Granite Grom monster truck. The Grom platform has become incredibly popular amongst UK RC enthusiasts thanks to its combination of affordability and performance potential, and upgrading critical suspension components like the rear lower arms is one of the smartest investments you can make to improve durability, stability and overall driving experience. Rather than replacing damaged plastic arms repeatedly, investing in these aluminium units means you're choosing long-term value and reliability.

Perfect for both beginners exploring RC car upgrades and experienced drivers seeking competition-grade components, the Fastrax Arrma Grom/Granite Aluminium Rear Lower Arms represent proven engineering from a manufacturer trusted across the UK RC hobby community. These arms work seamlessly with your existing Grom setup, making installation straightforward and the performance gains immediately noticeable.

Key Features

• Aluminium Construction — Manufactured from premium aluminium alloy, these rear lower arms offer significantly greater strength and durability compared to the standard plastic components that come with your Arrma Grom. Aluminium resists bending and deformation during hard impacts and rough terrain driving, meaning your suspension geometry stays true even after aggressive bashing sessions.
• Precision Engineering — Each pair of rear lower arms is engineered to exact specifications to ensure perfect fitment with your Arrma 1/18 Grom or Granite model. This precision means you get consistent handling performance and proper suspension alignment, which directly translates to better cornering, improved traction and more predictable vehicle behaviour on any terrain.
• Enhanced Durability — Switching from plastic to aluminium rear lower arms dramatically extends the lifespan of your suspension system. Where plastic arms might crack or snap during rough driving, these aluminium alternatives flex slightly to absorb impact energy whilst maintaining structural integrity, reducing replacement frequency and keeping your RC monster truck on the track longer.
• Improved Handling Characteristics — The rigidity of aluminium suspension arms provides better feedback to the chassis and wheels, resulting in more responsive steering input and improved suspension compliance. Your Grom will feel sharper through corners and more stable during high-speed runs across uneven terrain.
• Direct Compatibility — These rear lower arms are specifically designed for the Arrma 1/18 Granite Grom Mega 380 brushed 4x4 monster truck platform, ensuring perfect fitment without requiring additional modifications or adaptors. Available in multiple colour variants including Blue/Red, Green and Red, you can match your truck's aesthetic.
• Pair Supply — This product includes a pair of rear lower arms, giving you both left and right components needed for a complete rear suspension upgrade. You won't need to purchase multiple units unless you're running multiple vehicles.

Technical Performance

The Fastrax Arrma Grom/Granite Aluminium Rear Lower Arms represent a significant upgrade over standard plastic suspension components found on out-of-the-box ready to run RC monster trucks. Constructed from high-grade aluminium alloy, these arms deliver superior strength-to-weight ratio compared to polymer alternatives, meaning your Grom handles better without adding unnecessary mass to the chassis. The material choice is critical for 1/18 scale RC cars because whilst the vehicles are relatively light, suspension components experience forces concentrated across small surface areas, making material selection crucial for long-term reliability. Aluminium's natural rigidity ensures that suspension geometry remains consistent during cornering, braking and acceleration, which is particularly important on the Arrma Grom platform where suspension tuning directly affects how the vehicle tracks through turn-in and maintains traction across variable terrain. The engineering philosophy behind these arms focuses on maximising impact resistance without compromising the fine-tuning capabilities that serious RC drivers value. Whether you're driving across gravel, dirt, grass or rocky UK terrain, these rear lower arms work in conjunction with your vehicle's shock absorbers to maintain optimal wheel contact and suspension articulation. The transition from plastic to aluminium suspension is one of the most commonly recommended upgrades in UK RC forums and clubs because the performance improvement is both measurable and immediately noticeable, with drivers reporting sharper turn-in response, better stability under acceleration and increased durability through repeated bashing sessions.

What's in the Box

• One pair of Fastrax Arrma Grom/Granite Aluminium Rear Lower Arms (left and right)

Frequently Asked Questions

• Will these aluminium rear lower arms fit my Arrma Granite Grom? — Yes, these Fastrax FTAR053R rear lower arms are specifically engineered for the Arrma 1/18 Granite Grom Mega 380 brushed 4x4 monster truck. They're compatible with all colour variants of the Grom including the Blue/Red, Green and Red models. Installation is straightforward and requires no additional modifications to your vehicle.
• What's the difference between aluminium and plastic rear lower arms? — Aluminium rear lower arms are significantly more durable and rigid than plastic alternatives. Plastic arms can crack, warp or snap during hard impacts or extended bashing sessions, whilst aluminium resists these types of damage. The increased rigidity also provides better suspension response and handling precision, which means your Grom will feel more responsive through corners and maintain more consistent geometry during aggressive driving. Most UK RC drivers find that upgrading to aluminium suspension components represents excellent value because you spend less on replacements and enjoy better on-track performance simultaneously.
• Are these rear lower arms suitable for beginners? — Absolutely. These are an ideal upgrade for beginner and intermediate RC drivers looking to improve their vehicle's durability and handling. The installation process is straightforward—no special tools or technical knowledge required—and the performance improvement is immediately noticeable. Many UK RC clubs recommend suspension upgrades like these rear lower arms as one of the first modifications to make on your Grom, especially if you're planning to bash regularly.
• How do I know if I need to upgrade my rear lower arms? — If your Arrma Grom came with standard plastic suspension arms, upgrading to these aluminium alternatives is a wise investment. Signs you might need new rear lower arms include visible cracks or warping in the plastic arms, inconsistent handling characteristics, or if you're planning extended bashing sessions and want to minimise downtime due to component failure. Even if your current arms are undamaged, many UK drivers upgrade preemptively because the performance gains justify the modest investment.
• Will upgrading the rear lower arms change my Grom's handling significantly? — Yes, you should notice an improvement in several areas. The increased rigidity of aluminium suspension arms provides better steering response and cornering stability. Your Grom may feel slightly sharper through turn-in and maintain better traction during acceleration and braking. The improvement is particularly noticeable on rough terrain where suspension compliance is critical for maintaining consistent contact with the ground.
• What other suspension upgrades should I consider alongside these rear lower arms? — Whilst this product includes only the rear lower arms, many UK RC drivers often upgrade their front lower arms, shocks and anti-roll bars as part of a comprehensive suspension tune-up. Check the compatibility information for other Fastrax Arrma suspension components designed specifically for the Grom platform to build a complete upgraded suspension system.

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 LOWER ARMS (PR) FTAR053R 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.