RC Overhaul Pinion Gear 18T M0.5 2.3mm Shaft Chromium Steel G-RCO-AR032-18

• Manufacturer: RC Overhaul
• Part Number: G-RCO-AR032-18
• EAN Code: 5055320231493
• Gear Type: Pinion Gear
• Number of Teeth: 18T
• Gear Pitch: M0.5 (0.5 Modulus)
• Motor Shaft Bore: 2.3mm
• Material: Chromium Steel
• Finish: Black (corrosion resistant)
• Includes: M3 x 4mm Set Screw
• Vehicle Compatibility: Arrma Granite GROM 1:18 Scale (stock brushed motor)
• Fitment: Direct replacement for stock Grom pinions

Overview

The RC Overhaul Pinion 18T (M0.5, 2.3mm Shaft) G-RCO-AR032-18 is a premium replacement pinion gear designed specifically for the Arrma Granite GROM 1:18 scale RC car. Whether you're a dedicated RC enthusiast in the UK looking to upgrade your brushed motor setup or a hobbyist seeking reliable performance components, this pinion gear offers excellent value and durability. The 18-tooth configuration provides an ideal balance between acceleration and top speed, making it suitable for both casual basher runs and more competitive RC car UK enthusiasts who want to fine-tune their vehicle's performance characteristics.

Manufactured by RC Overhaul, a recognised brand in the RC car community, this pinion gear is engineered from chromium steel for exceptional strength and longevity. The material composition ensures that your motor shaft remains properly engaged with the spur gear, delivering consistent power delivery to your Arrma Granite GROM's drivetrain. The distinctive black finish not only looks professional but also provides inherent corrosion resistance, protecting your investment against moisture and dirt exposure during outdoor RC bashing sessions. This is a direct replacement for the stock brushed Grom pinions, meaning installation is straightforward and requires no modifications to your vehicle.

If you're building or maintaining an RC car in the UK, having quality spare pinion gears is essential for optimal performance and longevity. The 18-tooth pinion sits in the middle of the available tooth range, offering versatility for different driving styles and terrain types. Whether you're upgrading from worn stock pinions or experimenting with gear ratios for improved acceleration or top speed, the RC Overhaul 18T pinion gear is a trusted choice that has proven itself among the RC enthusiast community.

Key Features

• Chromium Steel Construction — The pinion gear is manufactured from chromium steel rather than standard steel, which provides significantly enhanced strength and durability under load, reducing wear and extending the lifespan of both the pinion and your motor shaft during intensive driving sessions.
• Corrosion-Resistant Black Finish — The natural black finish that results from chromium steel processing offers inherent protection against rust and corrosion, ensuring your pinion gear maintains its integrity even when exposed to damp UK weather conditions or after running through wet terrain.
• M0.5 Mod Pitch — The 0.5 modulus pitch ensures perfect compatibility with the standard Arrma Granite GROM spur gear and motor shaft, guaranteeing smooth, quiet mesh engagement and efficient power transfer from your brushed motor to the driveline.
• 2.3mm Motor Shaft Compatibility — This pinion gear is specifically engineered for the 2.3mm motor shaft found in stock Arrma Granite GROM brushed motor setups, making it a direct replacement that requires no shaft modifications or adaptations.
• 18-Tooth Configuration — The 18-tooth design strikes an excellent balance between acceleration and top speed, providing versatile performance that suits a range of driving conditions from tight indoor tracks to open outdoor bashing venues.
• Includes M3 x 4mm Set Screw — Every purchase includes the necessary M3 x 4mm set screw, which secures the pinion gear firmly to your motor shaft, eliminating the need to source this critical fastener separately.
• Direct Stock Replacement — This is a drop-in replacement for the original Arrma Granite GROM stock pinions, meaning no modification, adaptation, or additional components are required for installation on your ready to run RC car.

Technical Performance

The RC Overhaul Pinion 18T represents a significant upgrade over standard stock pinion gears whilst maintaining perfect compatibility with your Arrma Granite GROM 1:18 scale RC car. The chromium steel material selection is critical to performance and longevity; this hardened steel resists the constant meshing stress that occurs millions of times during a day of RC car bashing, preventing the tooth degradation that can occur with softer materials. The 0.5 modulus pitch is the industry standard for small-scale 1:18 RC vehicles, ensuring that the gear teeth engage smoothly with your spur gear without binding, slipping, or creating excessive noise. With a 2.3mm shaft bore, this pinion accommodates the standard Arrma brushed motor shaft without requiring any modification whatsoever. The 18-tooth count positions this gear perfectly in the middle of the performance spectrum; moving to a 16-tooth pinion would increase acceleration but sacrifice top speed, whilst jumping to a 20 or 22-tooth configuration prioritises top speed over quick acceleration. For most RC enthusiasts running a brushed motor in their Granite GROM, the 18-tooth setup provides excellent all-round performance whether you're enjoying a casual bash session at your local RC track or engaging in more spirited driving on various terrain types. The black chromium steel finish is not merely cosmetic; it actively protects against oxidation and corrosion, which is particularly valuable in the UK climate where moisture and salt-laden air can degrade uncoated metal components. This pinion gear will maintain its precision engagement and smooth operation throughout multiple seasons of regular use, provided it is stored correctly and occasionally cleaned of dirt and debris.

What's in the Box

• 1x RC Overhaul 18T Pinion Gear (M0.5 Modulus, Chromium Steel)
• 1x M3 x 4mm Set Screw

Frequently Asked Questions

• Is this pinion gear compatible with my Arrma Granite GROM RC car? — Yes, absolutely. The RC Overhaul Pinion 18T (M0.5, 2.3mm Shaft) G-RCO-AR032-18 is designed as a direct replacement for the stock brushed pinion gears supplied with the Arrma Granite GROM 1:18 scale ready to run RC car. No modifications to your vehicle are required; simply remove the old pinion, fit the new one onto your motor shaft, and tighten the included M3 x 4mm set screw.
• What do the specifications M0.5 and 2.3mm shaft mean? — M0.5 refers to the modulus pitch of the gear teeth, which must match your spur gear for proper meshing. The 2.3mm measurement indicates the bore diameter of the pinion hole, which must fit snugly on your brushed motor shaft. These specifications are standard for Arrma Granite GROM vehicles and ensure perfect compatibility.
• How does the 18-tooth count compare to other options? — The 18-tooth pinion is the middle option in the RC Overhaul range for the Granite GROM; the company also offers 16-tooth, 20-tooth, and 22-tooth alternatives. A 16-tooth pinion provides faster acceleration but lower top speed, whilst the 20 and 22-tooth gears favour top speed at the expense of launching quickly. The 18-tooth is the most versatile choice for general-purpose RC car UK hobbyists.
• Why is chromium steel better than standard steel? — Chromium steel offers superior hardness and wear resistance compared to mild or untreated steel. This means your pinion gear will maintain its tooth profile longer and resist the constant meshing stress imposed during driving, resulting in longer intervals between replacements and more consistent performance throughout the pinion's service life.
• Will this pinion work with a brushless motor? — The RC Overhaul 18T pinion is designed for brushed motors with a 2.3mm shaft. If you have upgraded to a brushless motor in your Granite GROM, you would need to verify that your brushless motor has a compatible 2.3mm shaft. We recommend consulting the motor manufacturer's specifications or contacting our team for compatibility advice.
• How often should I replace my pinion gear? — Pinion gear longevity depends on driving frequency, intensity, and maintenance practices. The chromium steel construction of this RC Overhaul pinion extends service life significantly. Regular inspection of your motor and gears, keeping them clean and free from dirt, and ensuring proper lubrication of the motor bearings will all contribute to longer gear life. Most RC enthusiasts find that a quality chromium steel pinion lasts several seasons of regular use before requiring replacement.
• Is this suitable for beginners? — Yes, this pinion gear is suitable for all experience levels. If you have an Arrma Granite GROM and need a replacement pinion, this is a straightforward swap. The only requirement is the ability to remove the old pinion (typically one set screw) and install the new one using the included fastener. No special tools beyond a basic screwdriver or hex key are needed.
• What is the difference between this and similar pinion models from other manufacturers? — RC Overhaul has established a strong reputation for precision engineering and material quality. The chromium steel construction of this pinion exceeds the specifications of many competitor offerings, and the inclusion of the M3 x 4mm set screw means you have everything needed for installation. RC Overhaul's commitment to the Arrma Granite GROM platform is demonstrated through their comprehensive range of purpose-designed spares and upgrades.

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 RCO Pinion 18T (M0.5, 2.3mm Shaft) G-RCO-AR032-18 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.

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