This tough steel 37T Mod1 Safe-D5 Pinion Gear is the perfect part to carry in your RC tool box
Features
- Strong and durable steel for long-lasting performance in extreme RC conditions
- Precision manufactured wide tooth profile for smooth operation
- 'D' shaped hole to match motor shaft profile so drive and brakes are not lost if the set-screw backs-out
- Suits 5mm motor shaft diameter
- Precision manufactured threaded set-screw hole
- E-clip supplied for motor shaft pinion retention
Includes
1 x 37T Mod1 Safe-D5 Pinion Gear
1 x Set Screw - M4 x 4mm
1 x E-Clip - 3.2mm
Overview
The ARRMA Pinion Gear, 37T Mod1 Safe-D5 is an essential replacement and upgrade component for RC enthusiasts running ARRMA 1/5 scale brushless stunt trucks and high-performance RC vehicles across the UK. This precision-engineered steel pinion gear is designed to deliver reliable power transfer from your brushless motor to the main drivetrain, making it the perfect part to carry in your RC tool box for both casual weekend bashing and competitive racing. Whether you're a seasoned RC car UK competitor or discovering the world of brushless RC vehicles for the first time, this pinion gear represents genuine ARRMA quality engineering and durability.
Specifically engineered for compatibility with the Arrma 1/5 Outcast 4X4 8S BLX EXB Brushless Stunt Truck RTR and similar high-power RC models, the 37T Mod1 specification delivers the optimal balance of acceleration and top-end speed for aggressive driving styles. The Safe-D5 bore design represents ARRMA's commitment to reliability, ensuring that your RC investment remains on the track or field rather than in the workshop. This is not simply a replacement part — it's a precision-manufactured component engineered to withstand the extreme forces generated by modern 8S LiPo brushless RC power systems.
For ready to run RC enthusiasts in the UK, having quality replacement gears like the ARRMA Pinion Gear on hand ensures minimal downtime when worn components need replacing. The 37T tooth count makes this an ideal choice for drivers seeking responsive handling and strong acceleration characteristics, particularly on high-powered brushless RC trucks and stunt vehicles that demand reliable drivetrain components.
Key Features
- Safe-D5 Bore Design — The distinctive D-shaped hole matches your motor shaft profile precisely, ensuring that drive and brakes are not lost if the set-screw backs out during aggressive driving. This safety-focused design is crucial for maintaining reliability during high-speed RC bashing and racing, giving you peace of mind that your drivetrain remains engaged even under extreme conditions.
- 37-Tooth Specification — The 37T tooth count is specifically engineered to deliver strong acceleration and balanced top-end speed performance. This makes the pinion ideal for competitive racing and high-performance RC driving where responsive throttle response is essential for maintaining control.
- Mod1 Gear Pitch — The Mod1 (Module 1) specification ensures perfect meshing compatibility with standard ARRMA main spur gears. This precision manufacturing standard guarantees smooth, efficient power transfer with minimal noise and maximum reliability during sustained high-speed operation.
- Durable Steel Construction — Manufactured from tough, hardened steel, this pinion gear delivers long-lasting performance in extreme RC conditions. Steel construction provides superior wear resistance compared to plastic alternatives, ensuring your investment maintains consistent performance across hundreds of charging cycles and intense driving sessions.
- Wide Tooth Profile — The precision-manufactured wide tooth profile delivers smooth operation throughout the entire gear mesh cycle. This design minimises vibration, reduces noise, and ensures even load distribution across all teeth, extending the lifespan of both the pinion and your main spur gear.
- Threaded Set-Screw Hole — The precision-manufactured threaded hole accepts the supplied M4 x 4mm set-screw, allowing secure retention of the pinion on your motor shaft. The threaded design ensures the set-screw seats properly without stripping, maintaining consistent grip through thousands of gear teeth rotations.
- 5mm Motor Shaft Compatibility — Designed to suit standard 5mm motor shaft diameter specifications found on ARRMA 1/5 brushless motors and many other high-performance RC power systems. This universal sizing ensures compatibility across a wide range of brushless RC cars and trucks available in the UK market.
- E-Clip Retention System — The included 3.2mm E-clip provides secondary retention of the pinion on the motor shaft, offering an additional layer of security beyond the set-screw alone. This dual-retention system is particularly valuable during extreme driving conditions where single-point fastening might prove insufficient.
Technical Performance
The ARRMA Pinion Gear 37T Mod1 Safe-D5 represents the pinnacle of precision RC component manufacturing, engineered specifically for high-performance brushless RC applications demanding absolute reliability. Built from hardened steel rather than softer materials, this pinion gear withstands the tremendous forces generated by modern 8S LiPo brushless power systems that deliver multi-kilowatt peak outputs. The 37-tooth specification strikes the perfect balance for competitive and recreational RC driving, providing strong launch acceleration whilst maintaining a usable top-end speed that won't cause traction loss on loose surfaces. The Mod1 gear pitch ensures perfect meshing characteristics with ARRMA main spur gears, which is absolutely critical for achieving smooth power delivery without the noise, vibration, and premature wear associated with poorly matched gear sets. The wide tooth profile distributes radial and tangential loads evenly across multiple gear teeth simultaneously, dramatically reducing peak stress on individual teeth and extending the overall working life of the drivetrain component. The Safe-D5 bore's D-shaped hole design is a genuine engineering advantage for high-powered brushless RC vehicles, as it mechanically locks the pinion to the motor shaft in a way that purely cylindrical holes cannot achieve. This design philosophy has been proven in thousands of competitive racing environments across the UK and internationally, making it the trusted choice for drivers who cannot afford drivetrain failures during important events. For anyone running brushless RC trucks, buggies, or stunt vehicles powered by 8S LiPo batteries, this pinion gear meets or exceeds the demanding performance and reliability requirements of modern RC motorsport.
What's in the Box
- 1 x ARRMA 37T Mod1 Safe-D5 Pinion Gear
- 1 x M4 x 4mm Set Screw for motor shaft fastening
- 1 x 3.2mm E-Clip for secondary pinion retention
Frequently Asked Questions
- Is the ARRMA 37T Mod1 Safe-D5 pinion gear suitable for my brushless RC truck? — This pinion gear is specifically engineered for ARRMA 1/5 scale brushless stunt trucks and is compatible with any RC vehicle featuring a 5mm motor shaft. If your brushless RC car or truck uses a standard 5mm motor shaft with Mod1 spur gears, this pinion will deliver reliable performance. Always verify your motor shaft diameter and spur gear specification before purchasing.
- What does the Safe-D5 bore design actually do? — The Safe-D5 D-shaped bore mechanically locks onto your motor shaft's flat edge, preventing the pinion from slipping even if the set-screw loosens due to vibration. This is a genuine safety feature that prevents drivetrain failure and maintains drive engagement during intense driving sessions, which is why it's favoured by competitive RC racers across the UK.
- How long will this pinion gear last? — Steel pinion gears of this quality typically provide thousands of kilometres of reliable service when properly maintained and meshed with a compatible spur gear. Lifespan depends heavily on driving style, surface conditions, and maintenance practices. Regular inspection and replacement of worn components ensures optimal drivetrain performance throughout the lifespan of your RC vehicle.
- What is the difference between the 37T and other tooth count options? — The 37-tooth specification is a mid-range pinion that balances acceleration and top speed. Lower tooth counts (like 35T or 36T) provide slightly more top-end speed but reduced acceleration, whilst higher tooth counts deliver stronger launch but lower maximum velocity. Choose based on your driving style and track layout preferences.
- Does this gear work with 8S LiPo brushless systems? — Yes, the ARRMA 37T Mod1 Safe-D5 is specifically designed for high-power brushless applications like 8S LiPo RC trucks. The hardened steel construction and precision Mod1 specification ensure reliability even under the extreme torque and speed demands of modern brushless motors.
- What tools do I need to install this pinion gear? — You'll need a small hex key or Allen wrench to tighten the M4 set-screw, and a small flat-blade screwdriver or specialised tool to install the 3.2mm E-clip. Most RC enthusiasts already have these basic tools in their workshop.
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, 37T Mod1 Safe-D5 Z-ARA311132 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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