- Part Type: Pinion Gear
- Brand: ARRMA
- Model Number: ARA310998
- Number of Teeth: 15
- Gear Pitch: 0.8 Module
- Bore Type: Safe-D5 (D-shaped)
- Motor Shaft Diameter Compatibility: 5mm
- Material: Steel
- Set Screw Included: M4 x 4mm (1 x supplied)
- E-Clip Included: 3.2mm (1 x supplied)
- Tooth Profile: Wide, precision manufactured
- Compatible Vehicle Scale Range: 1/10 and 1/8 scale
- Compatible Vehicle Types: Monster Trucks, Buggies, Stadium Trucks, Short Course Trucks, Speed Trucks, Stunt Trucks, Street Bash Trucks, Desert Trucks, Truggy
- Compatible Drive Systems: 2WD and 4WD
- Precision Features: Precision manufactured wide tooth profile, precision manufactured threaded set-screw hole, D-shaped bore for secure shaft engagement
Overview
The ARRMA 15T 0.8Mod Safe-D5 Pinion Gear is an essential replacement and upgrade component for RC enthusiasts running ARRMA brushless RC vehicles across 1/10 and 1/8 scale platforms. Whether you're a weekend basher pushing your RC monster truck to its limits, a competitive racer fine-tuning your RC buggy's performance, or a dedicated hobbyist maintaining your collection of brushless RC cars, this precision-engineered pinion gear delivers the durability and reliability you need. This tough steel pinion gear is designed to handle extreme RC conditions, making it the perfect part to carry in your RC tool box for both maintenance and performance upgrades.
The Safe-D5 design represents ARRMA's commitment to reliability in high-performance RC applications. Available across the UK from authorised retailers, this 15-tooth gear is compatible with an extensive range of ARRMA RTR (ready to run) and race-ready vehicles. The inclusion of a precision-manufactured set screw and E-clip retention system ensures you have everything needed to install and secure this component properly, making it ideal for RC car UK enthusiasts who demand quality aftermarket parts.
Built to perform under demanding conditions, the 15T 0.8Mod pinion gear features advanced manufacturing techniques that ensure consistent tooth engagement and smooth power delivery. Whether you're upgrading a 1/10 brushless monster truck, 1/8 scale buggy, or specialty RC vehicle, this component represents genuine ARRMA quality backed by customer ratings and proven performance across multiple vehicle platforms.
Key Features
- Strong and Durable Steel Construction — Manufactured from premium steel, this pinion gear is engineered for long-lasting performance in extreme RC conditions, ensuring it withstands the demands of high-speed running, aggressive acceleration, and challenging terrain without premature wear or failure.
- Precision Manufactured Wide Tooth Profile — The wide tooth design is precision-engineered to provide smooth operation and consistent engagement with spur gears, delivering reliable power transmission and reducing noise during acceleration and deceleration cycles.
- Safe-D Shaped Bore Design — The distinctive 'D' shaped hole matches the motor shaft profile perfectly, which means drive and brakes are not lost even if the set-screw backs out, providing a critical safety feature that prevents loss of vehicle control during operation.
- Compatible with 5mm Motor Shaft Diameter — This pinion gear is designed to fit standard 5mm motor shafts, making it compatible with the brushless motors found in most modern ARRMA RC vehicles and many aftermarket motor options.
- Precision Manufactured Threaded Set-Screw Hole — The M4 x 4mm set-screw hole is precision-threaded to ensure secure fastening without thread stripping, providing reliable retention and allowing for easy installation and removal during maintenance or adjustments.
- E-Clip Supplied for Motor Shaft Retention — The included 3.2mm E-clip provides additional retention security on the motor shaft, working in conjunction with the set-screw to prevent any possibility of the pinion gear slipping or separating during operation.
Technical Performance
The 15T 0.8Mod Safe-D5 Pinion Gear represents precision engineering at its finest, utilising premium steel construction that has been specifically tested and proven across ARRMA's entire range of brushless RC vehicles. The 0.8 module pitch is a standard measurement in RC gearing that defines the tooth size and spacing, ensuring perfect compatibility with ARRMA spur gears and transmission systems. With 15 teeth, this pinion provides a balanced gear ratio suitable for a wide range of driving styles and track conditions, from high-speed competition runs to casual backyard bashing. The precision manufacturing process ensures minimal runout and perfect tooth alignment, critical factors that determine smooth operation, reduced vibration, and extended drivetrain component lifespan. The wide tooth profile distributes load across a larger surface area, reducing stress concentration points and enabling the gear to handle the extreme torque and power delivery from modern brushless motor systems. Whether paired with 2S, 3S, or higher-voltage LiPo battery systems in brushless RC applications, this gear has been engineered and tested to deliver consistent performance without premature wear, chipping, or stripping. The Safe-D bore eliminates the common failure mode where pinion gears slip on motor shafts due to set-screw failure, a critical advancement for RC drivers who demand reliability in their RC cars UK.
What's in the Box
- 1 x 15T 0.8 Module Safe-D Pinion Gear
- 1 x Set Screw - M4 x 4mm
- 1 x E-Clip - 3.2mm
Frequently Asked Questions
- Which ARRMA RC vehicles is the 15T 0.8Mod Safe-D5 Pinion Gear compatible with? — This pinion gear is confirmed compatible with a comprehensive range of ARRMA brushless RC vehicles including the 1/10 BIG ROCK 223S 4x4 RTR, 1/10 FURY 223S DSC 2WD RTR, 1/10 GORGON 223S 2WD RTR, 1/10 GRANITE 223S 4x4 RTR, 1/10 KRATON 4S 4x4 RTR, 1/10 OUTCAST 4S 4x4 RTR, 1/10 QUAKE 223S DSC 2WD RTR, 1/10 SENTON 223S DSC 4x4 RTR, 1/10 VORTEKS 223S 4x4 RTR, 1/8 INFRACTION 223S DSC 4x4 RTR, 1/8 MOJAVE 4S 4x4 RTR, 1/8 TYPHON 3S 4x4 RTR, and 1/8 VENDETTA 3S 4x4 RTR. Always verify your specific model and version against the fitment list before ordering.
- What motor shaft size does this pinion gear fit? — The 15T 0.8Mod Safe-D5 Pinion Gear is designed for motor shafts with a 5mm diameter, which is the standard shaft size found on ARRMA brushless motors and most aftermarket 540-sized brushless motors used in RC cars UK.
- Why is the Safe-D shaped bore important for my RC vehicle? — The 'D' shaped hole matches the profile of your motor shaft, ensuring that even if the set-screw backing out, your vehicle will not lose drive or brakes. This safety feature is crucial for preventing loss of control during operation and is especially important for competitive racing or high-speed running where reliability is paramount.
- Do I need any additional tools or parts to install this pinion gear? — Installation is straightforward and requires only basic RC tools such as a small Allen key or hex wrench to tighten the M4 x 4mm set-screw. The pinion gear, set-screw, and E-clip are all included in the package, so no additional parts are needed for a complete installation.
- Is this a standard replacement part or a performance upgrade? — This pinion gear is an ARRMA genuine part designed as both a replacement for worn or damaged gears and as a performance component. Changing pinion gear teeth count allows you to adjust your vehicle's top speed and acceleration characteristics, making it both a maintenance item and a tuning tool for experienced RC enthusiasts.
- What is the difference between this 15-tooth gear and other tooth counts? — The number of teeth on a pinion gear directly affects your vehicle's speed and acceleration profile. A 15-tooth pinion provides a specific gear ratio; fewer teeth would increase top speed but reduce acceleration, whilst more teeth would increase acceleration but reduce top speed. The 15-tooth configuration is ideal for balanced performance across a wide range of driving conditions.
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 15T 0.8Mod Safe-D5 Pinion Gear 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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