- Manufacturer: ARRMA
- Part Number: Z-ARA-2630
- EAN: 5052127051415
- Product Type: Pinion Gear
- Number of Teeth: 15
- Gear Pitch: MOD 0.5
- Bore Diameter: 2.3mm
- Material: Steel
- Manufacturing Method: CNC (Computer Numerical Control)
- Set Screw Specification: M3 x 4mm
- Compatible Vehicles: ARRMA Gorgon Grom 4x4 (all colours), ARRMA Quake Grom 4x4 (all colours)
- Vehicle Scale: 1/16
- Vehicle Type: Brushed Monster Truck
- Included Items: 15T MOD 0.5 Pinion Gear, M3 x 4mm Set Screw
Overview
The ARRMA Pinion Gear 15T MOD 0.5 CNC 2.3mm Bore is a precision-engineered replacement pinion gear designed for RC enthusiasts who demand reliability and performance. Whether you're running an ARRMA 1/16 scale monster truck like the Gorgon Grom or Quake Grom, this tough steel component is built to withstand the extreme demands of off-road RC driving. This is an essential spare part for anyone serious about maintaining their RC car UK collection, ensuring smooth power delivery from motor to transmission every time you take to the track or trail.
Pinion gears are critical drivetrain components that transfer power from your motor to the main transmission system. As one of the most frequently replaced parts in high-performance RC vehicles, having quality replacement gears on hand is essential for serious RC hobbyists. The ARRMA 15T pinion gear represents genuine OEM quality from a trusted manufacturer, giving you the peace of mind that comes with using factory-specification parts rather than cheap aftermarket alternatives.
Built with precision manufacturing techniques including CNC machining, this pinion gear delivers the exact tooth profile and tolerances needed for smooth, reliable operation in competitive and recreational RC environments alike. Whether you're a weekend basher pushing your brushed monster truck to its limits or a serious competitor maintaining multiple vehicles, this replacement gear is an investment in longevity and performance.
Key Features
- Tough Steel Construction — This pinion gear is manufactured from high-strength steel that provides exceptional durability under the extreme stresses of RC driving, resisting wear and damage even during intense off-road sessions and competitive racing.
- Precision CNC Manufacturing — Computer numerical control machining ensures that every tooth is cut to exact specifications, delivering a consistent and perfectly formed gear profile that meshes smoothly with your transmission and minimizes noise and vibration.
- Precision Manufactured Set Screw Hole — The threaded hole for the set screw is machined to exact tolerances, ensuring perfect alignment and secure mounting to your motor shaft without slippage or wobbling during operation.
- MOD 0.5 Gear Pitch — This modulus specification is specifically designed to work seamlessly with ARRMA transmission systems, ensuring proper mesh engagement and load distribution across the tooth profile for maximum efficiency and longevity.
- 2.3mm Motor Shaft Compatibility — Precisely engineered to fit standard 2.3mm motor shafts found on ARRMA 1/16 scale brushed RC vehicles, making installation straightforward and ensuring secure mechanical fit without modification.
- 15 Tooth Configuration — The 15-tooth design provides an optimal balance of acceleration and top-end speed characteristics, making it ideal for the stock and modified setups commonly found in 1/16 scale monster truck racing.
- Direct OEM Replacement — Designed as a direct replacement for damaged or worn original pinion gears, this part integrates perfectly with your existing ARRMA RC car UK setup without requiring any additional modifications or adjustments.
Technical Performance
The ARRMA Pinion Gear 15T MOD 0.5 CNC 2.3mm Bore represents a critical drivetrain component engineered to precise tolerances using advanced CNC machining processes. This steel pinion gear is specifically designed for ARRMA 1/16 scale brushed monster trucks, where reliable power transmission is essential for both casual bashing and competitive racing. The MOD 0.5 pitch specification ensures compatibility with ARRMA transmission housings and spur gears, whilst the precisely manufactured tooth profile minimises friction losses and reduces noise during operation. The 2.3mm bore diameter matches the standard motor shafts on compatible ARRMA vehicles, and the drilled and tapped hole accepts the included M3 x 4mm set screw for secure installation. With 15 teeth, this pinion provides a balanced gear ratio suitable for everyday RC driving, offering good acceleration response without sacrificing top-end speed potential. The hardened steel construction withstands repeated engagement cycles and resists tooth stripping even under high-load conditions typical of off-road RC bashers. Whether you're replacing a worn original gear or upgrading to spare parts for your RC collection, this precision component delivers the performance and durability expected from genuine ARRMA factory parts.
What's in the Box
- 15T MOD 0.5 Pinion Gear
- M3 x 4mm Set Screw
Frequently Asked Questions
- What ARRMA RC vehicles is this pinion gear compatible with? — This 15T MOD 0.5 pinion gear is a direct replacement for the ARRMA Gorgon Grom (available in Yellow, Bronze and Red versions) and the ARRMA Quake Grom (available in Purple, Green and Red versions). Both of these are 1/16 scale brushed RTR monster trucks, and this gear fits all colour variants as they share the same drivetrain specification.
- How often will I need to replace this pinion gear? — Pinion gear lifespan depends heavily on driving style, motor power, maintenance, and track conditions. Casual weekend bashers might go several seasons between replacements, whilst competitive racers or users with heavily modified motors may need replacements more frequently. Regular inspection of the gear teeth for signs of wear or damage is recommended, and having spare pinion gears on hand is sensible for serious RC enthusiasts.
- What is MOD 0.5 and why does it matter? — MOD (modulus) is a specification that defines the size and pitch of gear teeth. MOD 0.5 gears have smaller, finer teeth designed for compact applications like 1/16 scale RC vehicles. Using the correct modulus specification is critical because it determines how the pinion engages with your spur gear, affecting mesh quality, noise levels, efficiency, and overall drivetrain reliability.
- How do I install this pinion gear onto my motor shaft? — The pinion gear slides onto your 2.3mm motor shaft, and the M3 x 4mm set screw (included) screws into the tapped hole to lock the gear in place. Ensure the set screw hole aligns with the flat or slot on your motor shaft, then tighten the set screw firmly to prevent any slippage during operation. Most RC builders use threadlocker on the set screw for added security.
- Is this suitable for both stock and modified ARRMA Grom trucks? — Yes, this is the original equipment pinion gear used in both stock ARRMA Gorgon Grom and Quake Grom trucks. It works with stock brushed motors and is suitable as a replacement when upgrading or maintaining your vehicle. However, if you've fitted a significantly higher power brushless motor conversion, you may want to consult the manufacturer for recommended gear ratios.
- What is the difference between this 15T pinion and other tooth counts? — Pinion tooth count directly affects your vehicle's final drive ratio and performance characteristics. A 15-tooth pinion is the stock specification for these ARRMA Groms and provides balanced acceleration and top speed. Lower tooth counts (like 13T or 14T) increase top speed but reduce acceleration, whilst higher tooth counts (16T or 17T) improve acceleration response but lower maximum speed. The 15T is the factory recommendation for general-purpose driving.
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 ARRMA Pinion Gear 15T MOD 0.5 CNC 2.3mm Bore Z-ARA-2630 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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