This tough steel 34T 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 34T Mod1 Safe-D8 Pinion Gear
1 x Set Screw - M4 x 4mm
1 x E-Clip - 6mm
- Brand: ARRMA
- Model Number: Z-ARA311122
- EAN: 5052127043489
- Product Type: Pinion Gear
- Tooth Count: 34T
- Gear Pitch: Mod 1
- Bore Type: Safe-D8 (D-shaped)
- Motor Shaft Diameter: 8mm
- Material: Steel
- Construction: Precision manufactured with wide tooth profile
- Set-Screw: M4 x 4mm (included)
- Retention Clip: E-Clip 6mm (included)
- Compatible Vehicles: ARRMA 1/5 Outcast 4X4 8S BLX EXB Brushless Stunt Truck RTR and other vehicles with 8mm motor shaft and Mod1 gear specification
- Features: Safe-D8 bore design prevents drive loss if set-screw backs out, precision threaded set-screw hole, E-clip supplied for motor shaft pinion retention
Overview
The ARRMA Pinion Gear, 34T Mod1 Safe-D8 is an essential replacement part for RC car enthusiasts and competitive racers across the UK. Whether you're running an ARRMA 1/5 scale brushless stunt truck or any RC vehicle equipped with an 8mm motor shaft, this precision-engineered pinion gear delivers the durability and reliability you need for consistent performance in extreme RC conditions. This is the kind of spare part that every RC hobbyist should carry in their RC tool box, ready to deploy when you need a quick swap during a track day or weekend bashing session.
Pinion gears are critical drivetrain components that directly impact your RC car's acceleration, top speed and overall drive characteristics. The ARRMA Safe-D8 series takes reliability to the next level with an innovative D-shaped bore design that prevents drive loss and brake disengagement if your set-screw ever backs out during aggressive driving. This is a genuine ARRMA part, manufactured to the exacting standards that have made ARRMA one of the most trusted brands for high-performance RC trucks and buggies in the UK and worldwide.
With 34 teeth and Mod1 pitch specification, this pinion gear is compatible with standard motor shafts and integrates seamlessly with ARRMA's complete drivetrain ecosystem. The included accessories—premium set-screw and E-clip—ensure you have everything needed for secure, rattle-free installation straight from the box.
Key Features
- Strong Steel Construction — This pinion gear is manufactured from durable hardened steel, engineered to withstand the extreme forces encountered during acceleration, cornering and high-speed running. Steel pinions last significantly longer than plastic alternatives, making this a worthwhile investment for any serious RC car owner.
- Safe-D8 Bore Design — The distinctive D-shaped hole matches the motor shaft profile precisely, preventing drive loss and brake disengagement if the set-screw backs out during intense driving. This safety-first engineering means you can push your RC car harder without fear of unexpected drivetrain failure, making it ideal for competitive racing and extreme bashing.
- Precision Manufactured Wide Tooth Profile — Each tooth is cut to exact specifications with a wide profile that ensures smooth, efficient power transfer from motor to gearbox. The precision manufacturing process eliminates backlash and provides consistent gear mesh with your motor, resulting in predictable acceleration and reduced drivetrain noise.
- 8mm Motor Shaft Compatibility — Designed specifically for 8mm motor shafts, this pinion gear integrates perfectly with ARRMA's brushless motor range and many aftermarket motors commonly used in high-performance RC cars. The standardised 8mm size ensures compatibility across multiple platforms and upgrades.
- Precision Threaded Set-Screw Hole — The set-screw hole is precisely threaded to accept the included M4 x 4mm fastener, ensuring a secure hold that resists vibration and maintains consistent gear engagement throughout your driving session.
- E-Clip Retention System — The included 6mm E-clip provides additional mechanical retention on the motor shaft, working in conjunction with the set-screw to lock the pinion gear firmly in place and prevent any axial movement or slipping under load.
Technical Performance
The ARRMA Pinion Gear, 34T Mod1 Safe-D8 represents the pinnacle of pinion gear engineering for high-performance RC cars. With 34 teeth and Mod1 pitch, this gear offers a balanced gear ratio suitable for a wide range of driving conditions, from high-speed track racing to aggressive off-road bashing. The Mod1 specification is the industry standard for modern RC vehicles, ensuring compatibility with a vast ecosystem of gearbox options and motor combinations. The steel construction provides exceptional wear resistance compared to nylon or polymer alternatives, particularly important when running on abrasive terrain or during extended racing sessions. The wide tooth profile design minimises stress concentrations at tooth root, distributing loads more evenly and extending service life even under extreme acceleration and high torque situations. The Safe-D8 bore technology is a game-changer for RC enthusiasts—the D-shaped hole creates a mechanical lock with your motor shaft that continues to drive and brake your vehicle even if the set-screw loosens, eliminating one of the most frustrating failure modes in RC driving. Precision manufacturing tolerances ensure that gear mesh is optimised, reducing parasitic losses and maximising energy transfer from your brushless motor to the wheels. Whether you're upgrading a stock ARRMA vehicle or replacing a worn pinion on an existing setup, this component delivers the durability and performance reliability that competitive RC car drivers demand.
What's in the Box
- 1 x 34T Mod1 Safe-D8 Pinion Gear
- 1 x Set Screw - M4 x 4mm
- 1 x E-Clip - 6mm
Frequently Asked Questions
- What does the Safe-D8 design mean and why is it important? — The Safe-D8 designation refers to the D-shaped bore design that matches the motor shaft profile. This innovative safety feature prevents complete drive loss and brake disengagement if your set-screw backs out during driving. Traditional round-hole pinion gears can spin freely on the motor shaft if the fastener loosens, leaving you without drive or brakes. The Safe-D8 design eliminates this risk, making it essential for competitive racing and demanding RC applications.
- Is this pinion gear suitable for beginners? — Absolutely. While this is a high-quality replacement part that experienced racers will appreciate, beginners benefit equally from its durability and reliability. Pinion gears are straightforward components to install, requiring only basic tools and a few minutes of your time. If you own an ARRMA RC vehicle and want to keep spare parts on hand for quick repairs, this is an excellent choice.
- What vehicle is this compatible with? — This pinion gear is specifically listed as compatible with the ARRMA 1/5 Outcast 4X4 8S BLX EXB Brushless Stunt Truck RTR. However, any RC vehicle with an 8mm motor shaft and Mod1 gear specification will accept this pinion. Always verify your vehicle's motor shaft diameter and gear pitch before ordering.
- How often do I need to replace my pinion gear? — Steel pinion gears like this one last considerably longer than plastic alternatives. With proper maintenance and lubrication, you can expect thousands of miles of driving before requiring replacement. However, carrying a spare in your RC tool box is smart practice for competition events or remote bashing locations where you cannot reach a hobby shop if damage occurs.
- What is the difference between 33T and 34T pinions? — The tooth count directly affects your vehicle's gearing ratio and performance characteristics. A 34T pinion (this gear) provides slightly lower gearing compared to a 33T, resulting in slightly less top speed but improved acceleration and hill-climbing capability. The choice between 33T and 34T depends on your track layout, driving style and desired performance balance. Most drivers prefer the 34T for all-round capability.
- Do I need any special tools to install this pinion gear? — No special tools are required. You'll need a small hex key or Allen wrench to tighten the M4 set-screw, both of which typically come with your RC car or can be purchased inexpensively. The E-clip installs by hand or with a small flathead screwdriver. Installation takes only a few minutes.
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, 34T Mod1 Safe-D8 Z-ARA311122 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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