This tough steel 20T MOD0.5 Pinion Gear provides a direct replacement for your kit item.
Features
- Strong and durable steel for long-lasting performance in extreme RC conditions
- Precision manufactured tooth profile for smooth operation
- Precision manufactured set screw hole
- For 2.3mm motor shaft
Includes
1 x 20T Mod 0.5 Pinion Gear
1 x M3 x 4mm Set Screw
- Brand: ARRMA
- Model Number: Z-ARA311206
- Product Type: Pinion Gear
- Number of Teeth: 20T
- Gear Pitch: MOD 0.5
- Motor Shaft Bore Diameter: 2.3mm
- Material: Steel (hardened)
- Manufacturing Process: CNC machined
- Set Screw: M3 x 4mm (included)
- Compatible with ARRMA Granite Grom MEGA 380 Brushed 4x4 Monster Truck (all colour variants: Red C-ARA2102T2, Blue/Red C-ARA2102T1, Green C-ARA2102T3)
- Compatible with ARRMA Mojave Grom MEGA 380 Brushed 4x4 Small Scale Desert Truck (Red C-ARA2104T1, Blue C-ARA2104T2)
- Compatible with ARRMA Mojave Grom 4x4 RTA Race Kit (C-ARA2104KT1)
- Compatible with ARRMA Typhon Grom MEGA 380 Brushed 4x4 Buggy (Blue/Silver C-ARA2106T1, Red/White C-ARA2106T2)
- Package Contents: 1x 20T MOD 0.5 Pinion Gear, 1x M3 x 4mm Set Screw
- EAN: 5052127047470
- Tooth Profile: Precision manufactured for smooth operation
Overview
The ARRMA Pinion Gear 20T 0.5Mod CNC 2.3mm Bore is an essential replacement component for RC enthusiasts who demand precision engineering and reliability in their electric RC cars. Whether you're running a high-performance 1/18 scale Granite Grom, Mojave Grom, or Typhon Grom, this pinion gear is engineered to deliver consistent performance in extreme RC conditions. For UK RC hobbyists, having genuine ARRMA replacement parts on hand ensures your RC vehicle stays in peak condition, ready for the next bash session or competition.
This tough steel pinion gear serves as a direct replacement for your original kit item, making it the perfect choice whether you're upgrading your existing setup or replacing worn components after intensive use. Small scale RC vehicles like the Granite Grom, Mojave Grom and Typhon Grom series require precise drivetrain components to maintain smooth power delivery and acceleration, and this CNC-manufactured pinion gear delivers exactly that. RC car enthusiasts across the UK trust ARRMA components for their durability and performance characteristics.
If you're new to RC or a seasoned competitor, understanding your vehicle's drivetrain components is crucial to maintaining optimal performance. The pinion gear is a critical element that meshes with your main gear, directly affecting your RC car's acceleration, top speed and overall handling characteristics. This precision-engineered component ensures that power from your motor is efficiently transferred to your drive system without slippage or excessive wear.
Key Features
- Strong and durable steel construction — This pinion gear is manufactured from hardened steel that resists wear and deformation during intense RC driving sessions, ensuring long-lasting performance even when pushing your RC vehicle to its limits in extreme conditions.
- Precision manufactured tooth profile — Each tooth is CNC-machined to exact specifications, delivering smooth meshing with your main gear and eliminating vibration that could compromise acceleration smoothness or create noise during operation.
- Precision manufactured set screw hole — The mounting hole is engineered to exacting tolerances, ensuring your pinion gear sits perfectly on the motor shaft without wobbling or shifting during high-speed driving.
- Compatible with 2.3mm motor shaft — This pinion gear is specifically designed for motors with a 2.3mm bore diameter, making it an exact fit for ARRMA Granite Grom, Mojave Grom and Typhon Grom RTR vehicles running MEGA 380 brushed motors.
- MOD 0.5 gear pitch specification — The MOD 0.5 designation refers to the tooth profile standard, ensuring compatibility with matching spur gears in your RC vehicle's drivetrain and preventing damage from mismatched components.
- 20-tooth configuration — The 20T tooth count provides the exact gear ratio needed for optimal performance in your compatible ARRMA vehicle, balancing acceleration and top speed characteristics.
Technical Performance
The ARRMA Pinion Gear 20T 0.5Mod CNC represents professional-grade engineering for small-scale RC enthusiasts. CNC machining ensures every tooth is manufactured to identical specifications, eliminating the weak points found in lower-quality injection-moulded gears. The hardened steel construction provides superior durability compared to composite materials, resisting the stripping and wear that occurs during aggressive driving in extreme RC conditions. The 2.3mm bore diameter matches the motor shafts found in ARRMA's MEGA 380 brushed motor systems, which are commonly fitted to 1/18 scale RTR vehicles. The MOD 0.5 gear pitch is an industry-standard specification that ensures perfect meshing with your vehicle's main spur gear, maintaining smooth power delivery across the entire RPM range. Whether you're bashing at high speeds or navigating technical courses, this pinion gear maintains consistent gear engagement, reducing stress on your drivetrain components and extending the overall lifespan of your RC vehicle's transmission system.
What's in the Box
- 1 x 20T Mod 0.5 Pinion Gear (steel, CNC-manufactured)
- 1 x M3 x 4mm Set Screw (for secure mounting to motor shaft)
Compatible Vehicles
This pinion gear is a direct replacement for the following ARRMA RTR models:
- ARRMA 1/18 Granite Grom MEGA 380 Brushed 4x4 Monster Truck (all colour variants)
- ARRMA 1/18 Mojave Grom MEGA 380 Brushed 4x4 Small Scale Desert Truck (all colour variants)
- ARRMA 1/16 Mojave Grom 4x4 RTA Race Kit (Battery and Charger Included)
- ARRMA 1/14 Typhon Grom MEGA 380 Brushed 4x4 Buggy (all colour variants)
Frequently Asked Questions
- What does a pinion gear do in an RC car? — The pinion gear is mounted on your motor shaft and meshes with the main spur gear in your RC vehicle's gearbox. It's responsible for transferring power from your electric motor to your wheels, directly affecting your vehicle's acceleration, top speed and overall performance characteristics. If your pinion gear becomes worn or stripped, you'll notice reduced acceleration and uneven power delivery.
- When should I replace my RC pinion gear? — You should consider replacing your pinion gear if you notice grinding sounds during acceleration, reduced acceleration performance, visible tooth wear or damage to the gear teeth. Regular replacement during maintenance schedules helps prevent damage to your more expensive spur gear and motor components.
- Is the ARRMA 20T pinion gear suitable for beginners? — Yes, replacement parts like this pinion gear are ideal for beginner RC enthusiasts who are learning vehicle maintenance. The straightforward installation process (removing the old gear, sliding on the new one, and tightening the set screw) makes this an excellent introductory repair task that helps you understand your RC vehicle's drivetrain system.
- What is the difference between 19T, 20T and other tooth counts? — The tooth count determines your vehicle's final gear ratio. A 20T pinion provides a specific balance between acceleration and top speed for ARRMA Grom vehicles. If you want quicker acceleration, you'd use fewer teeth; for higher top speed, you'd use more teeth. The 20T is the OEM specification for optimal performance across these ARRMA models.
- Do I need any special tools to install this pinion gear? — Installation is straightforward and requires only a small wrench or Allen key to loosen and tighten the M3 set screw that secures the gear to your motor shaft. No specialist RC tools are required, making this an accessible upgrade for all skill levels.
- Is this the correct pinion gear for my ARRMA RC vehicle? — This 20T 0.5Mod pinion gear with 2.3mm bore is compatible with all ARRMA Granite Grom, Mojave Grom and Typhon Grom models equipped with MEGA 380 brushed motors. Always verify your motor shaft size (2.3mm) and your vehicle model before ordering to ensure compatibility.
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 20T 0.5Mod CNC 2.3mm Bore Z-ARA311206 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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