- Manufacturer Part Number: ARA310481
- Product Type: Pinion Gear
- Gear Teeth: 20T
- Gear Module: MOD1
- Material: Steel
- Motor Shaft Size: 5mm
- Set Screw Size: M4x4mm
- Set Screws Included: 2
- Compatible with ARRMA 1/7 Mojave 6S 4x4 RTR
- Compatible with ARRMA 1/7 Mojave 6S EXB 4x4 Roller
- Compatible with ARRMA 1/8 Kraton 6S 4x4 RTR
- Compatible with ARRMA 1/8 Kraton 6S 4x4 Roller
- Compatible with ARRMA 1/8 Notorious 6S 4x4 RTR
- Compatible with ARRMA 1/8 Outcast 6S 4x4 RTR
- Compatible with ARRMA 1/8 Outcast 6S 4x4 Limited Edition RTR
- Compatible with ARRMA 1/8 Talion 6S 4x4 RTR
- Compatible with ARRMA 1/8 Typhon 6S 4x4 RTR
- Direct replacement for stock pinion gear
- Customer Rating: 4.8 out of 5
Overview
The ARRMA 20T Mod1 Pinion Gear is a precision-engineered replacement component designed for RC enthusiasts who demand reliability and performance from their brushless RC vehicles. Whether you're running an ARRMA 1/8 scale speed truck, stunt truck, buggy, or the impressive 1/7 scale Mojave desert truck, this steel pinion gear provides the durable, direct replacement solution you need to keep your RC car UK-ready and competition-capable. With a customer rating of 4.8 out of 5, this component has earned trust among serious RC hobbyists across the UK and beyond.
This super-tough steel 20T MOD1 pinion gear is engineered to withstand the extreme conditions that modern brushless RC vehicles demand. Whether you're a weekend basher pushing your truck to its limits or a competitive racer fine-tuning every aspect of your setup, this pinion gear delivers the durability and precision you need. The inclusion of two M4x4mm set screws ensures secure fitment, while the precision-manufactured design guarantees smooth operation and long-lasting performance. It's the kind of essential spare component that every serious RC car UK owner should keep in their toolkit.
For anyone running a ready to run brushless RC truck or buggy from ARRMA's current range, this pinion gear is a critical component that deserves your attention. Understanding when to replace your pinion gear and choosing quality components like this one can significantly extend the lifespan of your RC transmission system and improve overall performance consistency.
Key Features
- Strong and durable steel construction — This pinion gear is manufactured from high-quality steel that provides exceptional strength and durability, making it capable of handling the extreme forces and stresses generated by high-performance brushless motors and demanding off-road conditions without premature wear or failure.
- Precision manufactured tooth profile — The teeth are engineered with precision to ensure smooth, efficient meshing with your spur gear, reducing noise, minimising energy loss, and delivering consistent power transmission during acceleration and cruising for optimal RC performance.
- Double set screw holes for extra security — The precision manufactured double set screw holes allow you to fit M4x4mm set screws on either side of the motor shaft, providing redundant securing points that prevent unwanted gear slip and keep your pinion firmly locked in place even during high-power runs and aggressive cornering.
- Fits 5mm motor shaft — This gear is specifically designed to fit standard 5mm motor shafts found across ARRMA's brushless motor range, ensuring straightforward installation on compatible models without modification or adapter components.
- Includes essential mounting hardware — The package comes complete with two M4x4mm set screws, meaning you have everything required to install this gear securely on your motor shaft without needing to source additional fasteners.
Technical Performance
The 20T MOD1 pinion gear represents a critical component in the drivetrain of modern brushless RC vehicles. With 20 teeth, this gear works in conjunction with your vehicle's spur gear to determine your final drive ratio, directly affecting acceleration, top speed, and overall power delivery. The MOD1 specification refers to the module (tooth pitch) of the gear, which is a standardised measurement system in RC gear design that ensures compatibility with matching spur gears. Manufactured from high-quality steel rather than cheaper plastic alternatives, this pinion delivers superior durability and longevity when used in brushless RC trucks, buggies, and vehicles like the ARRMA 1/7 Mojave 6S, 1/8 Kraton 6S, Notorious 6S, Outcast 6S, Talion 6S, and Typhon 6S models. The precision-manufactured tooth profile is engineered using modern manufacturing techniques to ensure each tooth is cut to exact specifications, eliminating run-out and ensuring perfect mesh with your spur gear. This level of precision is essential for smooth power transmission, reduced friction losses, and quieter operation. The double set screw mounting system with two M4x4mm fasteners provides redundant security, preventing the gear from slipping on the 5mm motor shaft even under maximum power delivery or during aggressive acceleration and cornering manoeuvres. In the context of a complete brushless RC system, this pinion works with your brushless motor, electronic speed controller (ESC), and spur gear to create the final transmission ratio that determines your vehicle's performance characteristics.
What's in the Box
- 1 x Steel 20T MOD1 Pinion Gear
- 2 x M4x4mm Set Screws
Frequently Asked Questions
- Which ARRMA vehicles does the 20T Mod1 pinion gear fit? — This pinion gear is designed as a direct replacement part for multiple ARRMA models, including the 1/7 Mojave 6S 4x4 RTR, 1/7 Mojave 6S EXB 4x4 Roller, 1/8 Kraton 6S 4x4 RTR, 1/8 Kraton 6S 4x4 Roller, 1/8 Notorious 6S 4x4 RTR, 1/8 Outcast 6S 4x4 RTR, 1/8 Outcast 6S Limited Edition, 1/8 Talion 6S 4x4 RTR, and 1/8 Typhon 6S 4x4 RTR. Always verify your specific model before purchasing to ensure compatibility.
- Why would I need to replace my pinion gear? — Over time, the teeth on a pinion gear can wear down through continuous use, particularly in demanding brushless RC applications. Worn teeth result in poor mesh with your spur gear, causing slipping, noise, vibration, and eventual drivetrain failure. Replacing your pinion gear when worn restores smooth power transmission, improves performance, and prevents damage to connected components.
- What is the benefit of steel over plastic pinion gears? — Steel pinion gears are significantly more durable and stronger than plastic alternatives, making them ideal for brushless RC applications where high torque and continuous high-speed operation place extreme demands on drivetrain components. Steel gears resist wear better, last longer, and handle aggressive driving without degradation, making them the preferred choice for serious RC enthusiasts.
- How do I install the 20T Mod1 pinion gear? — This is a direct replacement component that fits onto a 5mm motor shaft. Slide the gear onto your motor shaft, align the set screw holes, and secure it using the included M4x4mm set screws on both sides of the motor shaft. Ensure the gear is seated properly and the set screws are tightened securely to prevent slipping during operation.
- Is this suitable for beginners? — This is a replacement transmission component intended for users who already own an ARRMA vehicle and understand basic RC drivetrain maintenance. It is not a standalone product for beginners without RC experience. However, if you already own a compatible ARRMA ready to run brushless RC truck or buggy, keeping spare pinion gears as part of your maintenance kit is a sensible practice.
- What is MOD1 and why does it matter? — MOD1 refers to the gear module, which is a standardised measurement system indicating the pitch and size of the teeth. MOD1 gears are designed to mesh precisely with MOD1 spur gears. Using the correct module specification ensures proper mesh geometry, smooth power transmission, and compatibility with your vehicle. Mixing different modules will result in poor 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 20T Mod1 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.
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
- Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
- Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
- If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
- We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
- As soon as your order is on its way we will send you a tracking number by email. If you provide your mobile number at checkout we will also send delivery updates straight to your phone so you can keep an eye on progress.
- If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
