Overview
The ARRMA Pinion Gear, 31T Mod1 Safe-D5 (Z-ARA311136) is a genuine replacement pinion gear engineered specifically for high-performance RC vehicles. This precision-machined component is an essential upgrade or replacement part for dedicated RC enthusiasts across the UK who demand reliability and performance from their electric RC cars. Whether you're a seasoned basher, competition racer, or hobbyist running an ARRMA vehicle, a quality pinion gear is fundamental to optimising your RC car's acceleration, top speed and overall drivetrain efficiency.
Manufactured by ARRMA, a brand recognised worldwide for producing durable and high-performance RC vehicles and components, this pinion gear represents genuine OEM (Original Equipment Manufacturer) quality. If your current pinion has worn teeth, stripped gears or you're looking to fine-tune your RC car's gearing setup, this 31-tooth replacement gear is the authorised solution. It's compatible with the Arrma 1/5 Outcast 4X4 8S BLX EXB Brushless Stunt Truck RTR and other vehicles using the Safe-D5 bore specification, making it an essential spare part for keeping your RC monster truck or stunt vehicle performing at peak capability.
For RC hobbyists in the UK seeking reliable drivetrain components, pinion gears are wear items that eventually require replacement after extensive use. By choosing genuine ARRMA parts, you ensure compatibility, durability and performance that matches your vehicle's original engineering specifications. This pinion gear is the right choice for anyone serious about maintaining their brushless RC truck.
Key Features
- 31 Teeth Configuration — The 31-tooth count is precisely engineered to provide optimal acceleration and speed balance for the vehicles it's designed for, giving you predictable performance across varied terrain and driving conditions.
- Mod 1 Gear Pitch — This specification refers to the gear's module rating, which ensures perfect mesh compatibility with your vehicle's spur gear and transmission components, preventing slippage and power loss during acceleration.
- Safe-D5 Bore — The Safe-D5 bore design is ARRMA's proprietary shaft connection system that provides secure, slip-free engagement with your RC car's motor shaft, preventing the common problem of gears spinning loose under heavy acceleration or impact.
- Genuine ARRMA OEM Part — As an authorised manufacturer component, this pinion gear meets ARRMA's strict quality and durability standards, ensuring it will last through countless bashings, races and recreational sessions.
- Precision Engineering — Each tooth is machined to exact tolerances, delivering smooth power transfer and minimising drivetrain noise and vibration that can indicate worn or damaged gears.
Technical Performance
This pinion gear is engineered for use in brushless RC vehicle systems, specifically designed to work seamlessly with the drivetrain found in the Arrma 1/5 Outcast 4X4 8S BLX EXB Brushless Stunt Truck RTR. The 31-tooth Mod1 specification ensures optimal mesh engagement with spur gears, delivering the precise gear ratio balance that ARRMA's engineers tuned for this vehicle platform. The Safe-D5 bore is a secure connection interface that prevents slippage, a critical requirement for high-torque brushless motors that can generate tremendous power. Whether you're running 3S, 4S, or 6S LiPo batteries in your ARRMA vehicle, this pinion gear is calibrated to handle the performance demands of modern brushless RC systems. The precision-cut teeth resist wear better than aftermarket alternatives, and the hardened steel construction means you can enjoy consistent performance for extended periods. If you're upgrading from a worn stock pinion or experimenting with different gearing ratios, this component delivers the reliability that serious RC car enthusiasts expect from authorised OEM parts.
What's in the Box
- ARRMA Pinion Gear, 31T Mod1 Safe-D5
Frequently Asked Questions
- What vehicles is this pinion gear compatible with? — This pinion gear is confirmed compatible with the Arrma 1/5 Outcast 4X4 8S BLX EXB Brushless Stunt Truck RTR. It features the Safe-D5 bore specification, so it will fit any ARRMA vehicle using this same bore interface. Always check your RC vehicle's manual to confirm the correct pinion tooth count and bore type before purchasing.
- What does Mod1 gear pitch mean? — Mod1 refers to the module specification of the gear teeth. This is a standardised measurement that ensures the pinion gear meshes perfectly with your vehicle's spur gear. Using the correct gear pitch is essential for smooth power delivery and preventing tooth damage during acceleration.
- How often do pinion gears need replacing? — Pinion gears are wear items that gradually lose tooth definition through use. If you notice reduced acceleration, grinding noises from the drivetrain, or visible tooth damage, it's time for a replacement. Regular bashing will require more frequent pinion changes than occasional recreational driving.
- Will this pinion fit my RC car? — Compatibility depends on two factors: the Safe-D5 bore must match your vehicle's motor shaft, and the 31-tooth count must be correct for your gearing setup. This pinion is specifically listed as compatible with the Arrma 1/5 Outcast 4X4 8S BLX EXB. For other ARRMA vehicles, verify your manual lists the Safe-D5 bore specification before purchasing.
- What's the difference between genuine ARRMA gears and aftermarket alternatives? — Genuine ARRMA pinion gears are manufactured to the exact specifications your vehicle was engineered around. They provide superior tooth durability, precise mesh engagement and guaranteed compatibility. Aftermarket gears may differ slightly in pitch or bore design, potentially causing fitment issues or drivetrain noise.
- Can I use a different tooth count to change my RC car's speed? — Yes, gearing ratios directly affect acceleration and top speed. A higher tooth count (more teeth) increases top speed but reduces acceleration, whilst a lower tooth count improves acceleration but limits top speed. Always ensure your chosen pinion tooth count is compatible with your transmission and motor power rating.
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, 31T Mod1 Safe-D5 Z-ARA311136 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.
