Overview
The ARRMA 18T 0.8Mod Safe-D5 Pinion Gear is an essential transmission component designed for serious RC enthusiasts running ARRMA brushless RC vehicles. This tough steel pinion gear is the perfect spare part to carry in your RC toolbox, whether you're a weekend basher enjoying high-speed runs or a competitive racer pushing your RC car UK to its limits. Built to withstand extreme RC conditions, this precision-manufactured gear delivers reliable performance across a wide range of ARRMA models, from nimble 1/10 scale stadium trucks to powerful 1/8 scale buggies and desert trucks.
Whether you're upgrading your drivetrain, replacing a worn gear, or simply stocking essential spares, this pinion gear represents genuine ARRMA quality and engineering. The Safe-D design ensures that even if your set-screw backs out during intense driving sessions, your drive and brakes won't be lost, giving you peace of mind whether you're racing on-road or bashing off-road. This is the kind of reliable component that serious RC car enthusiasts depend on to keep their vehicles running smoothly day after day.
Compatible with a wide range of ARRMA ready to run RC models, this 18-tooth pinion gear is an excellent investment in the longevity and performance of your brushless RC vehicle. Its universal appeal across multiple ARRMA platforms makes it a must-have spare that serious RC hobbyists should always have on hand.
Key Features
- Strong and durable steel construction — The pinion gear is manufactured from robust steel that resists wear and deformation, ensuring long-lasting performance even in extreme RC conditions where shock loads and high torque demands are common.
- Precision manufactured wide tooth profile — The carefully engineered tooth geometry provides smooth engagement with the spur gear, reducing noise and vibration while maximising power transmission efficiency for better acceleration and overall drive feel.
- Safe-D shaped bore — The distinctive D-shaped hole matches your motor shaft profile precisely, which means drive and brakes are not lost even if the set-screw backs out during intense driving sessions, a critical safety feature for reliable RC performance.
- 5mm motor shaft diameter compatibility — This pinion gear is designed to fit standard 5mm motor shafts found across most ARRMA RC vehicles, making it a direct replacement for worn gears on your existing setup.
- Precision manufactured threaded set-screw hole — The M4 x 4mm threaded hole is precisely machined to accept the included set-screw, ensuring secure retention and eliminating slippage under load.
- E-clip motor shaft retention — The included 3.2mm E-clip provides additional axial retention on your motor shaft, offering extra security and preventing accidental gear separation during aggressive driving.
- 0.8 Module pitch specification — This gear pitch is specifically engineered for ARRMA's drivetrain systems, ensuring perfect meshing with compatible spur gears for efficient power delivery across your RC car UK.
Technical Performance
The ARRMA 18T 0.8Mod Safe-D5 Pinion Gear represents high-quality transmission engineering designed specifically for brushless RC vehicles. With 18 teeth and 0.8 module pitch, this pinion gear delivers the optimal balance of acceleration and top speed for most ARRMA models, whether you're running a 1/10 brushless monster truck, a nimble 1/10 stadium truck, or a powerful 1/8 desert truck. The precision-manufactured steel construction provides exceptional durability under the extreme demands of modern brushless RC motors, which deliver high RPM output and significant torque. The wide tooth profile geometry is engineered to distribute stress evenly across multiple teeth during engagement, reducing point loading and extending gear life significantly compared to standard pinion designs. The Safe-D bore design is a critical engineering feature that prevents loss of drive and braking capability if your set-screw backs out—a common concern with high-vibration RC applications. The M4 x 4mm set-screw works in conjunction with the included 3.2mm E-clip to provide dual-stage retention, ensuring your pinion gear remains securely mounted even during aggressive driving sessions with high acceleration and sudden braking forces. This is the kind of robust engineering that makes ARRMA components the choice of serious RC enthusiasts across the UK.
What's in the Box
- 1 x 18T 0.8 Module Safe-D Pinion Gear
- 1 x Set Screw - M4 x 4mm
- 1 x E-Clip - 3.2mm
Frequently Asked Questions
- What ARRMA RC models is this pinion gear compatible with? — This 18T 0.8Mod Safe-D5 pinion gear is a standard parts fitment for a wide range of ARRMA vehicles including the 1/10 BIG ROCK 223S and 3S monster trucks, the 1/10 FURY and SENTON short course trucks, the 1/10 GRANITE 223S and 3S monster trucks, the 1/10 KRATON and OUTCAST speed and stunt trucks, the 1/10 VORTEKS stadium trucks, the 1/8 INFRACTION street bash truck, the 1/8 MOJAVE desert truck, the 1/8 TYPHON buggy, and the 1/8 VENDETTA street bash. If you own any of these ready to run RC models, this is the correct replacement gear for standard drivetrain configuration.
- Why would I need to replace my pinion gear? — Over time, pinion gears experience wear from constant meshing with the spur gear, especially in high-performance brushless RC vehicles running fast speeds or aggressive driving styles. Teeth may become rounded, stripped, or damaged from impact, leading to slippage, noise, or loss of power transfer. Keeping a spare 18T pinion gear in your RC toolbox ensures you can quickly get back to driving without downtime.
- What does the Safe-D design actually do? — The Safe-D shaped bore matches your motor shaft profile with a flat edge, so even if your set-screw backs out due to vibration during intense driving, the D-shaped connection prevents your pinion gear from spinning freely on the motor shaft. This means you won't lose drive or braking capability, keeping your RC vehicle under control in critical moments.
- Is this suitable for beginners? — Whilst this is a replacement spare part rather than a complete drivetrain component, it's an excellent part for beginners to understand and learn to install. Changing a pinion gear is a straightforward maintenance task that teaches valuable RC hobbyist skills. You'll need basic tools and a short amount of time to complete the installation.
- What motor shaft diameter does this fit? — This pinion gear is designed for 5mm motor shaft diameter, which is the standard specification found on most ARRMA brushless RC vehicles. Always verify your motor shaft diameter before purchasing to ensure compatibility.
- Will this fit my competitor's RC vehicle? — Whilst this is specifically designed as ARRMA standard parts, some other RC manufacturers may use compatible 0.8 module gears with 5mm shafts. However, we recommend confirming fitment with the manufacturer of your specific vehicle before purchasing, as drivetrain specifications can vary significantly between brands.
- How long does a pinion gear typically last? — The lifespan of a pinion gear depends heavily on your driving style, terrain, and maintenance. Casual weekend bashers might get many months of use, whilst competitive racers pushing high speeds and aggressive acceleration may wear through a gear more quickly. Regular inspection for wear and keeping spare gears on hand is good practice for any serious RC enthusiast.
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 18T 0.8Mod Safe-D5 Pinion Gear Z-ARA311001 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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