- Brand: ARRMA
- Model Number: ARA311078 / Z-ARA311078
- Product Type: 16 Tooth Pinion Gear
- Material: CNC Steel
- Gear Module: 0.8 Mod
- Motor Shaft Bore: 1/8 inch (3.175mm)
- Bore Size: 3.2mm
- Tooth Count: 16T
- Manufacturing Process: Precision CNC Machined
- Tooth Profile: Wide profile for smooth operation
- Mounting System: M4 x 4mm threaded set screw
- Set Screw Included: Yes - M4 x 4mm
- Gear Identification: Laser etched tooth count
- Compatible with: ARRMA 1/8 scale vehicles with 0.8 module transmission
- Fitment Models: ARA4215V3 (INFRACTION 4X4 RTR), ARA4206V4 (TYPHON MEGA 665 4X4 RTR), and other compatible 1/8 scale ARRMA models
- Customer Rating: 4.1 out of 5
Overview
The ARRMA 16T 0.8Mod 1/8 inch Bore CNC Steel Pinion Gear is an essential transmission component for RC enthusiasts looking to fine-tune and optimise the performance of their 1/8 scale RC vehicles. Whether you're running a competitive buggy, a high-performance all-road street bash, or a dedicated racing machine, this precision-engineered pinion gear allows you to adjust your vehicle's gear ratio to suit different track conditions, driving styles and performance goals. Available now at RC Model Shop, this genuine ARRMA part is engineered to the highest standards and is the perfect upgrade for owners of compatible 1/8 scale RC cars and buggies across the UK.
This tough steel pinion gear has been precision CNC machined to deliver exceptional durability and reliability, even in extreme RC racing conditions. The 16-tooth configuration combined with the 0.8 module specification makes this gear compatible with a wide range of ARRMA models, and it's specifically designed to work with motor shafts measuring 1/8 inch (3.175mm) in diameter. The gear's robust steel construction ensures it can handle the high torque and rotational speeds demanded by modern brushless RC motors, making it an excellent choice for both recreational bashers and competitive racers who demand performance and longevity from their equipment.
If you're serious about getting the best out of your 1/8 scale RC buggy or all-road street bash vehicle, having spare pinion gears in different tooth counts is essential. The ARRMA 16T pinion allows you to experiment with gear ratios to find the perfect balance between acceleration, top speed and throttle response for your specific racing conditions. This is particularly valuable for UK RC enthusiasts who compete at different venues with varying track layouts and surface types.
Key Features
- CNC Precision Machined Construction — Every tooth and bearing surface on this pinion gear has been precisely engineered using computer numerical control machinery, ensuring perfect consistency and fitment with your existing transmission components, which directly translates to smoother operation and longer component life.
- Strong and Durable Steel Material — The gear is manufactured from high-quality steel rather than softer aluminium, providing superior strength and resistance to wear during intense RC racing and bashing sessions, particularly important when running high-KV brushless motors that generate significant torque.
- Wide Tooth Profile for Smooth Operation — The generously proportioned tooth design minimises mesh noise and reduces wear on both the pinion gear and your vehicle's spur gear, ensuring quieter operation and more reliable power transmission at all RPM ranges.
- 1/8 Inch (3.175mm) Motor Shaft Bore — This gear is specifically engineered for 1/8 scale RC motors with the standard 3.175mm shaft diameter, ensuring perfect fitment without excessive play or runout that could cause vibration and premature wear.
- Laser Etched Tooth Count Identification — Each gear is clearly marked with its tooth count directly onto the steel body, making it instantly recognisable in your pit box or spare parts box, eliminating any confusion when managing multiple pinion gears with different ratios.
- Precision Manufactured Threaded Set-Screw Hole — The mounting hole has been precisely engineered with internal threads to accept the included M4 x 4mm set screw, providing secure and repeatable clamping force that prevents the gear from slipping or rotating on the motor shaft under load.
- Includes M4 x 4mm Set Screw — The essential mounting hardware is included in the box, meaning you have everything needed to install this gear immediately without requiring additional fasteners from your spares box.
Technical Performance
This 16-tooth pinion gear represents a mid-range tooth count in the ARRMA transmission system, offering a balanced approach to gear ratio tuning. The 0.8 module specification is the standard pitch for ARRMA 1/8 scale drivetrain components, ensuring perfect mesh compatibility with corresponding spur gears and delivering optimal power transmission efficiency. The CNC steel construction provides exceptional strength-to-weight ratio compared to plastic alternatives, with the material's hardness and rigidity ensuring the teeth maintain their shape and profile even after extended use at high RPM. The wide tooth profile engineered into this design significantly reduces contact stresses between meshing gears, which translates to lower noise levels, reduced vibration, and extended component lifespan when used in demanding RC conditions. The precision machining tolerances ensure that runout is minimised to negligible levels, preventing the kind of vibration and wear that can result from even slight imperfections in gear geometry. For UK RC competitors running 1/8 scale buggies, all-road street bashers, and mega motors in their machines, this pinion gear offers the reliability and performance characteristics necessary for consistent racing results. The M4 threaded mounting system provides positive engagement without relying on friction alone, delivering the secure clamping necessary to prevent slippage during hard acceleration or when running high-torque brushless motors.
What's in the Box
- 1 x ARRMA 16T 0.8 Module CNC Steel Pinion Gear
- 1 x M4 x 4mm Set Screw for mounting
Frequently Asked Questions
- What is the 0.8 module specification and why does it matter? — Module is a measurement of gear tooth pitch used in metric gear systems. The 0.8 module specification indicates the tooth spacing and size, ensuring this pinion gear meshes correctly with ARRMA spur gears also specified as 0.8 module. Using incorrect module gears will result in poor mesh, excessive noise, vibration and premature wear, which is why matching modules is critical.
- Which ARRMA models is this 16T pinion gear compatible with? — According to ARRMA's specifications, this pinion is listed as suitable for a range of 1/8 scale models including the INFRACTION 4X4 RTR, TYPHON MEGA 665 4X4 RTR buggy, and various other 1/8 scale ARRMA vehicles with compatible transmission systems. Always verify your specific model number against the detailed fitment list before purchasing to ensure compatibility.
- How does changing the pinion gear tooth count affect my RC car's performance? — The tooth count directly determines your vehicle's gear ratio when paired with a specific spur gear. A lower tooth count (like 14T or 15T) increases the final drive ratio for faster top speed but slower acceleration, whilst a higher tooth count (like 17T or 18T) reduces the ratio for quicker acceleration but lower top speed. The 16T configuration offers a balanced middle ground suitable for mixed racing conditions across UK tracks and venues.
- Is this pinion gear suitable for beginners? — Yes, this is a straightforward replacement part suitable for anyone comfortable performing basic RC car maintenance. The installation process simply involves removing the old pinion, sliding the new gear onto the motor shaft, and securing it with the included set screw. No special tools beyond a small hex key are required.
- What is included with this pinion gear? — Each purchase includes one 16T CNC steel pinion gear and one M4 x 4mm set screw for mounting. This provides everything necessary for installation on your vehicle's motor shaft.
- Why choose steel over plastic pinion gears? — Steel pinion gears offer significantly superior durability compared to plastic alternatives, particularly important when running high-power brushless motors that generate substantial torque. Steel gears resist wear more effectively, maintain their tooth profile longer, and can handle the extreme RPM ranges demanded by modern RC racing without deformation.
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 16T 0.8Mod 1/8 inch Bore CNC Steel Pinion Gear Z-ARA311078 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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