ARRMA Steel Pinion Gear 15T Mod1 5mm Bore for RC Brushless Vehicles AR310476

• Manufacturer: ARRMA
• Model Number: AR310476
• Horizon Hobby Part Number: ARAC7776
• Product Type: Transmission - Pinion Gear
• Tooth Count: 15T
• Gear Pitch: MOD1 (Modulus 1)
• Motor Shaft Bore Diameter: 5mm
• Material: High-quality steel
• Set Screw Specification: M4x4mm
• Quantity of Set Screws Included: 2
• Fitment: 5mm brushless motor shafts
• Compatible Vehicles: ARRMA MOJAVE 6S, KRATON 6S, NOTORIOUS 6S, OUTCAST 6S, TALION 6S, TYPHON 6S
• Direct OEM replacement for ARRMA stock pinion gears
• Customer Rating: 3.9 out of 5 stars
• In Stock: Yes

Overview

The ARRMA Steel Pinion Gear 15T Mod1 5mm is a precision-engineered replacement component designed for serious RC enthusiasts who demand durability and reliability in their brushless RC vehicles. This high-quality steel pinion gear is the ideal direct replacement for stock items across ARRMA's range of 1/7 and 1/8 scale brushless RC trucks, buggies and stunt vehicles. Whether you're running an RC car UK-based or competing internationally, this gear represents the gold standard in transmission components for ARRMA models including the MOJAVE 6S, KRATON 6S, NOTORIOUS, OUTCAST, TALION and TYPHON platforms.

Built from super-tough steel, this 15T pinion gear is engineered to withstand the extreme stresses of high-performance RC racing and bashing. The precision-manufactured tooth profile ensures smooth, efficient power transfer from your brushless motor to the transmission, reducing noise and vibration whilst maximising acceleration response. If you've experienced pinion gear wear or damage on your ready to run RC truck, this OEM part is your solution for restoring factory performance and reliability.

The 5mm bore diameter makes installation straightforward on any compatible ARRMA vehicle, and the inclusion of dual M4x4mm set screws provides extra-secure fastening either side of the motor shaft. This is genuine ARRMA replacement hardware, not an aftermarket alternative, meaning perfect fitment and compatibility with your existing drivetrain components.

Key Features

• Super-tough steel construction — Manufactured from high-grade steel specifically chosen for its exceptional durability and resistance to tooth stripping, ensuring long-lasting performance even under extreme RC driving conditions including high-speed bashing and competitive racing.
• Precision-manufactured tooth profile — Each tooth is engineered to exacting tolerances for smooth engagement with the spur gear, delivering efficient power transfer and reducing drivetrain noise and wear across your transmission components.
• 15-tooth configuration — The 15T specification provides the optimal balance between acceleration and top speed for stock and mildly-modified ARRMA vehicles, making it the perfect upgrade when replacing a worn or damaged original pinion.
• MOD1 gear pitch standard — Engineered to MOD1 specifications for complete compatibility with ARRMA spur gears and transmission housings, ensuring perfect meshing engagement and smooth operation.
• 5mm motor shaft bore — Designed specifically for 5mm diameter brushless motors as fitted to ARRMA 6S vehicles, guaranteeing proper fitment without modification or adaptors.
• Dual set screw holes — Features precision-manufactured double set screw holes allowing M4x4mm set screws to be installed either side of the motor shaft for enhanced security, preventing rotation and slippage under acceleration and cornering loads.
• Two M4x4mm set screws included — Everything you need for secure installation is included in the box, with hardened steel set screws that hold fast under extreme RC conditions.
• OEM replacement component — This is genuine ARRMA factory hardware, not a third-party alternative, ensuring absolute compatibility with your specific vehicle model and year.

Technical Performance

The Steel Pinion Gear 15T Mod1 5mm represents ARRMA's commitment to quality in transmission components. Constructed from carefully selected steel alloy, this pinion gear is engineered to handle the enormous power output of modern 6S brushless RC systems. The 15-tooth configuration is the factory standard for ARRMA's 1/7 and 1/8 scale vehicles including the MOJAVE 6S, KRATON 6S, NOTORIOUS 6S, OUTCAST 6S and TYPHON 6S models. The MOD1 gear pitch means the tooth profile is optimised for engagement with ARRMA spur gears, delivering smooth mesh characteristics and minimising backlash in the drivetrain. With a 5mm bore diameter, this gear mounts directly onto 5mm brushless motor shafts as found across ARRMA's 6S range. The precision manufacturing process ensures runout is minimal, critical for high-speed operation where any imbalance would cause vibration and premature wear. The dual set screw arrangement—with two M4x4mm fasteners securing the gear on either side of the motor shaft—provides industry-leading hold-down security, preventing rotation which would cause catastrophic drivetrain failure during hard acceleration or high-speed cornering. Whether you're running a 6S LiPo-powered RTR model or a highly-tuned competition setup, this pinion gear delivers the reliability and durability you need for consistent performance lap after lap.

What's in the Box

• 1 x Steel 15T MOD1 Pinion Gear with 5mm bore
• 2 x M4x4mm hardened steel set screws for motor shaft security

Frequently Asked Questions

• Which ARRMA vehicles does the 15T steel pinion gear fit? — This gear is compatible with all ARRMA 1/7 and 1/8 scale 6S brushless models including the MOJAVE 6S 4X4 RTR, KRATON 6S 4X4, NOTORIOUS 6S 4X4 RTR, OUTCAST 6S 4X4 RTR, TALION 6S 4X4 RTR and TYPHON 6S 4X4 vehicles. It provides a direct OEM replacement for the stock pinion gear on these models.
• Why would I need to replace my pinion gear? — Pinion gears experience wear over time, especially in high-performance applications or when driving on abrasive surfaces. Teeth may become damaged from impacts, stripped from overloading, or worn down from thousands of operational hours. A replacement pinion restores acceleration response and prevents drivetrain damage from poor mesh characteristics.
• Is this a genuine ARRMA part? — Yes, this is the official ARRMA Steel Pinion Gear 15T Mod1 5mm, model number AR310476. It is genuine OEM hardware manufactured to ARRMA's exacting specifications, not an aftermarket clone or replica.
• What is the difference between 15T and other tooth counts? — Pinion gear tooth count affects the final drive ratio and therefore the balance between acceleration and top speed. A 15T pinion provides the standard factory configuration for ARRMA 6S vehicles. Lower tooth counts (14T, 13T) increase top speed but reduce acceleration, whilst higher counts (16T, 17T) do the opposite. The 15T is the optimal choice for stock and mild modifications.
• Do I need any tools to install this gear? — Installation requires a hex key or Allen wrench to fit the M4x4mm set screws, and you may need to remove your motor to access the pinion. Most RC enthusiasts can complete installation in 10-15 minutes, but if you're unsure, a local RC shop or hobby retailer can install it for you.
• Will this work with aftermarket spur gears? — As long as the aftermarket spur gear is MOD1 pitch and compatible with ARRMA vehicles, this pinion will mesh correctly. However, always confirm compatibility before purchasing to avoid drivetrain issues.
• How often should I replace my pinion gear? — In casual bashing, a pinion may last several seasons. In high-performance competitive driving, you might replace it annually or even more frequently. Regular inspection of the teeth for wear, chipping or stripping will tell you when replacement is needed.
• Is the 15T gear suitable for beginners? — Yes. The 15T is the factory specification for ARRMA ready-to-run vehicles, making it the correct choice if you've lost or damaged your original pinion. Beginners should stick with the factory tooth count to maintain predictable handling and performance.

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 Steel Pinion Gear 15T Mod1 5mm 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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