This tough steel 31T Mod1 Safe-D8 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 8mm motor shaft diameter
- Precision manufactured threaded set-screw hole
- E-clip supplied for motor shaft pinion retention
Includes
1 x 31T Mod1 Safe-D8 Pinion Gear
1 x Set Screw - M4 x 4mm
1 x E-Clip - 6mm
Overview
The ARRMA Pinion Gear, 31T Mod1 Safe-D8 is an essential replacement and upgrade component for RC enthusiasts across the UK who demand reliability and performance from their electric RC cars and trucks. Whether you're a seasoned RC competitor, a weekend basher, or someone new to the hobby of RC car UK racing, having quality pinion gears in your RC tool box is absolutely crucial for maintaining peak performance and avoiding mid-run failures. This precision-engineered steel gear is specifically designed to deliver consistent power transmission and smooth operation in extreme RC conditions, making it an ideal choice for anyone running an 8mm motor shaft diameter setup.
Pinion gears are one of the most critical drivetrain components in any RC vehicle, as they directly transfer power from your motor to the main gear and ultimately to the wheels. A high-quality pinion gear like this ARRMA unit ensures you maintain maximum drive efficiency, consistent braking performance, and reliable operation whether you're tackling off-road tracks, grass terrains, or concrete surfaces. The Safe-D8 design adds an extra layer of security and peace of mind, particularly important for competitive RC car UK users and serious hobbyists who need their equipment to perform reliably lap after lap or run after run.
This tough steel 31T Mod1 Safe-D8 Pinion Gear represents excellent value for money and is the perfect spare part to have on hand for your ready to run RC vehicle or custom build. Available from RC Model Shop, this genuine ARRMA component comes complete with all the hardware you need to get up and running, including a precision-manufactured set screw and retention e-clip.
Key Features
- Strong and Durable Steel Construction — This pinion gear is manufactured from hardened steel specifically chosen for its ability to withstand the extreme stresses and impacts that come with competitive and casual RC driving conditions, ensuring long-lasting performance and resistance to wear even under constant use.
- Precision Manufactured Wide Tooth Profile — The wide tooth profile design has been engineered with precision to ensure smooth meshing with your main gear, reducing noise, vibration and wear whilst delivering consistent power transfer and improved overall drivetrain efficiency in your RC car or truck.
- Safe-D8 Security Design — The distinctive D-shaped hole matches your motor shaft profile perfectly, meaning that even if the set-screw should back out during aggressive driving or competition use, your drive and brakes will not be lost, preventing catastrophic drivetrain failure and keeping you racing or bashing safely.
- 8mm Motor Shaft Compatibility — This pinion gear is specifically designed to suit 8mm diameter motor shafts, ensuring a perfect fit and secure connection with standard brushless motors commonly found in modern RC vehicles across the UK hobby market.
- Precision Manufactured Threaded Set-Screw Hole — The threaded hole for the M4 x 4mm set-screw has been precision manufactured to exacting standards, ensuring consistent clamping force and reliable retention of the pinion gear on your motor shaft without slippage.
- E-Clip Motor Shaft Retention — An e-clip is included and supplied to provide secondary retention on your motor shaft, adding an extra safety layer to prevent accidental gear separation during high-speed runs or extreme driving conditions common in RC racing and bashing.
- 31-Tooth Configuration — With 31 teeth and Mod1 gear pitch, this pinion offers an excellent balance between acceleration and top speed for most RC vehicle applications, making it a versatile choice for general-purpose ready to run RC cars and trucks.
Technical Performance
The ARRMA Pinion Gear, 31T Mod1 Safe-D8 represents the pinnacle of precision gear manufacturing for the RC hobby market in the UK and beyond. Crafted from high-strength steel and manufactured to exacting tolerances, this pinion gear delivers the durability and reliability that competitive and casual RC enthusiasts demand. The 31-tooth configuration with Mod1 pitch provides an excellent ratio for acceleration and top speed performance, making it suitable for a wide range of RC vehicle types from stadium trucks to off-road buggies and crawlers. The safe-D8 technology is particularly noteworthy; this security feature prevents complete drivetrain loss if your set-screw becomes loose, a common issue that can result in stranded vehicles mid-race or mid-session. The precision-manufactured wide tooth profile ensures smooth, quiet operation with minimal backlash, which translates to more responsive handling and better power delivery to your wheels. At 8mm motor shaft diameter compatibility, this gear works seamlessly with standard brushless motors found in most modern RC vehicles, from entry-level ready to run kits through to high-performance competition rigs. The included M4 x 4mm set-screw and 6mm e-clip provide a complete retention system, offering peace of mind that your pinion gear will stay firmly secured under all driving conditions, whether you're pushing your RC car to its limits on the track or enjoying casual weekend bashing sessions.
What's in the Box
- 1 x 31T Mod1 Safe-D8 Pinion Gear
- 1 x Set Screw - M4 x 4mm
- 1 x E-Clip - 6mm
Frequently Asked Questions
- What motor size does this ARRMA pinion gear fit? — This 31T Mod1 Safe-D8 pinion gear is designed to suit 8mm motor shaft diameter, which is the standard size found on most modern brushless RC motors used in contemporary RC vehicles, from ready to run RTR cars through to competition-grade builds.
- What is the Safe-D8 feature and why does it matter? — The Safe-D8 is a security design feature that uses a D-shaped hole to match your motor shaft profile exactly. This means that if your set-screw ever backs out during driving, the gear will not separate completely and you will not lose drive and brakes, keeping your RC car operational and preventing the frustration of a stranded vehicle during important races or practice sessions.
- Is this pinion gear suitable for beginners? — Yes, absolutely. This pinion gear is an excellent replacement component for beginners and experienced RC enthusiasts alike. It is a straightforward drop-in replacement for compatible RC vehicles, and the included set-screw and e-clip make installation quick and easy. Beginners will appreciate the safety features and reliable performance.
- What is the difference between 31-tooth and other tooth counts? — Tooth count directly affects your vehicle's speed and acceleration characteristics. A 31-tooth pinion (like this one) provides a balanced middle ground for most RC applications. Fewer teeth (like 29T or 27T) will give you more acceleration but lower top speed, whilst more teeth will increase top speed at the expense of acceleration. The 31T makes this a versatile choice for general-purpose RC use across different driving styles.
- Will this work with my existing RC car? — This gear will work with any RC vehicle that uses an 8mm motor shaft diameter and Mod1 pitch gears. Check your vehicle's specifications or manual to confirm compatibility, or contact the RC Model Shop team for advice if you're unsure whether this pinion will work with your specific RC car or truck model.
- What tools do I need to install this pinion gear? — Installation is straightforward and requires only basic tools: a small hex key or Allen wrench to tighten the M4 set-screw, and a moment to slide the e-clip onto the motor shaft. No specialist equipment is needed, making this a perfect maintenance item for any RC hobbyist to keep in their tool box.
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, 31T Mod1 Safe-D8 Z-ARA311119 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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