This tough steel 17T 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 17T Mod 0.5 Pinion Gear
1 x M3 x 4mm Set Screw
- Brand: ARRMA
- Part Number: Z-ARA311203
- EAN: 5052127047500
- Product Type: Pinion Gear
- Number of Teeth: 17T
- Gear Pitch: MOD0.5 (Module 0.5)
- Bore Diameter: 2.3mm
- Material: Hardened Steel
- Manufacturing Process: CNC (Computer Numerically Controlled)
- Set Screw Included: M3 x 4mm
- Compatible Motor Type: MEGA 380 Brushed Motor
- Compatible Vehicle Models: ARRMA 1/18 GRANITE GROM (all variants), ARRMA 1/18 MOJAVE GROM (all variants), ARRMA 1/16 MOJAVE GROM 4x4 RTA Race Kit, ARRMA 1/14 TYPHON GROM (all variants)
- Tooth Profile: Precision manufactured for smooth operation
Overview
The ARRMA Pinion Gear 17T 0.5Mod CNC 2.3mm Bore (Z-ARA311203) is an essential replacement component for RC enthusiasts running ARRMA's popular small-scale 4WD models. Whether you're a dedicated basher, weekend racer, or someone new to the RC car hobby in the UK, this precision-engineered pinion gear delivers the reliability and performance you need to keep your RC vehicle running smoothly. This tough steel gear is specifically designed as a direct replacement for original kit items, ensuring perfect compatibility and fit every time.
Pinion gears are critical drivetrain components that transfer power from your RC motor to the main transmission, directly affecting your vehicle's acceleration, top speed and overall handling characteristics. The 17-tooth configuration with MOD0.5 pitch is optimised for the MEGA 380 brushed motor systems found in ARRMA's GROM range, making this the ideal upgrade or replacement component for owners of these popular ready-to-run RC trucks and buggies. If you're looking for a quality spare part to get your ARRMA RC car back in action quickly, this OEM pinion gear is manufactured to factory specifications.
ARRMA is renowned throughout the RC car UK community for delivering durable, high-performance vehicles at competitive prices, and this replacement component upholds that same commitment to quality. The precision CNC machining ensures smooth engagement with your spur gear, reducing noise, vibration and wear during intense off-road adventures or track sessions.
Key Features
- Strong and durable steel construction — This pinion gear is manufactured from hardened steel that withstands the extreme forces and stresses encountered in RC racing and bashing, ensuring long-lasting performance whether you're driving on asphalt, dirt, grass or carpet tracks.
- Precision CNC manufactured tooth profile — Every tooth is cut to exact specifications using computer numerically controlled machinery, guaranteeing smooth, quiet engagement with your spur gear and reducing premature wear on the drivetrain components.
- Precision manufactured set screw hole — The mounting hole is machined to tight tolerances to ensure secure, repeatable installation on your motor shaft without slipping or play, maintaining consistent power delivery lap after lap.
- Optimised for 2.3mm motor shaft — This gear features a 2.3mm bore diameter, making it the perfect fit for ARRMA's MEGA 380 brushed motor systems used in their GROM lineup of 1/18 and 1/14 scale vehicles.
- MOD0.5 pitch specification — The MOD0.5 module rating ensures compatibility with matching spur gears in your ARRMA drivetrain, delivering the correct gear mesh and ratio for optimal performance.
- Includes mounting hardware — Each gear ships with an M3 x 4mm set screw, so you have everything needed to install it immediately on your motor shaft without hunting for compatible fasteners.
Technical Performance
This 17-tooth pinion gear represents a critical drivetrain component in RC car engineering. The CNC machining process ensures that each tooth profile matches ARRMA's original specifications precisely, maintaining proper mesh geometry when engaged with your vehicle's spur gear. The hardened steel material provides exceptional durability under the demanding conditions of RC motorsport, resisting the high rotational forces generated by brushed motor systems running at full throttle. The 0.5 module pitch is a standard specification in small-scale RC vehicles, and the 2.3mm bore diameter is specifically engineered for MEGA 380 brushed motors, which are commonly found in ARRMA's GROM range of 1/18 scale monster trucks and 1/14 scale buggies. The precision-manufactured set screw hole ensures that installation is straightforward and repeatable, with no risk of the gear slipping on your motor shaft during acceleration or cornering. For UK-based RC enthusiasts running ARRMA GROM trucks and buggies, this pinion gear is an authentic OEM component that restores your vehicle to factory performance specifications.
What's in the Box
- 1 x 17T MOD0.5 Pinion Gear
- 1 x M3 x 4mm Set Screw
Frequently Asked Questions
- Which ARRMA RC models is this pinion gear compatible with? — This 17T pinion gear is compatible with the ARRMA 1/18 GRANITE GROM (all colour variants), ARRMA 1/18 MOJAVE GROM (all colour variants), ARRMA 1/16 MOJAVE GROM 4x4 RTA Race Kit, and the ARRMA 1/14 TYPHON GROM (all colour variants). If you own any of these GROM-series vehicles, this is the correct replacement gear for your MEGA 380 brushed motor.
- What does the 17T specification mean? — The 17T refers to the number of teeth on the pinion gear. This 17-tooth configuration is paired with a specific spur gear size to achieve the correct overall gear ratio in your ARRMA GROM vehicle, balancing acceleration and top speed for optimal performance.
- What is MOD0.5 and why does it matter? — MOD0.5 (Module 0.5) is a standard gear pitch specification used in small-scale RC vehicles. It describes the tooth size and spacing, ensuring that this pinion gear will mesh perfectly with the matching spur gear in your ARRMA drivetrain. Using the correct module is essential for smooth, quiet operation and longevity of your drivetrain.
- Is this suitable for both beginners and experienced RC drivers? — Yes, this is a suitable replacement component for all skill levels. Whether you're new to RC cars or an experienced competitor, maintaining original equipment specification parts ensures your vehicle performs as designed. Installing a pinion gear is a straightforward task that most RC enthusiasts can handle with basic tools.
- How do I know when I need to replace my pinion gear? — Signs that your pinion gear may need replacement include unusual grinding or clicking sounds from the drivetrain, visible tooth damage when you inspect the gear, or difficulty engaging the spur gear. If you've had your ARRMA GROM for extended periods of heavy use, inspecting the pinion gear during routine maintenance is a good practice.
- What tools do I need to install this pinion gear? — Installation requires only basic tools: an appropriate hex wrench or socket set to remove your motor, and a small screwdriver or hex key to tighten the M3 x 4mm set screw included with this gear. The entire installation process typically takes just a few minutes.
- Is this an authentic OEM ARRMA part? — Yes, this is an official ARRMA component (part number Z-ARA311203) manufactured to the same specifications as the pinion gears supplied in new ARRMA GROM vehicles, ensuring perfect compatibility and performance.
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 17T 0.5Mod CNC 2.3mm Bore Z-ARA311203 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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