Overview
The ARRMA 31T 0.8Mod Safe-D5 Pinion Gear Z-ARA311014 is an essential replacement and upgrade component for RC enthusiasts across the UK who demand reliability and performance from their electric RC cars and trucks. This precision-engineered steel pinion gear is designed to deliver consistent power transmission and durability in the most demanding RC racing and bashing conditions. Whether you're running a competitive RC buggy, a high-speed RC truck, or upgrading your existing setup, this 31-tooth pinion gear represents the kind of quality engineering that separates serious RC hobbyists from casual users.
Built from tough, durable steel, this pinion gear is manufactured to exacting standards by ARRMA, a brand trusted by RC enthusiasts worldwide. The 0.8 Module specification ensures compatibility with a wide range of RC motor setups, making it an ideal addition to your RC toolbox. The innovative Safe-D5 bore design sets this pinion gear apart from standard alternatives available to the UK RC market, offering a level of security and reliability that prevents unexpected failures during critical moments in racing or recreational driving.
If you're an RC hobbyist who values quality components, smooth operation, and peace of mind knowing your gear won't slip or disengage unexpectedly, the ARRMA 31T 0.8Mod Safe-D5 Pinion Gear is the perfect choice. This is the kind of precision component that distinguishes professional-grade RC setups from budget alternatives, and it's available right here at RC Model Shop for UK customers.
Key Features
- Strong and Durable Steel Construction — This pinion gear is manufactured from tough steel material engineered to withstand extreme RC conditions, delivering long-lasting performance whether you're racing competitively or bashing on weekends. Steel construction provides superior strength compared to lighter materials, ensuring the gear maintains its integrity through countless drive cycles.
- Precision Manufactured Wide Tooth Profile — The carefully engineered tooth profile ensures smooth, reliable power transmission from your motor to the drivetrain with minimal noise or vibration. This precision design reduces wear on both the pinion gear and meshing spur gear, extending the lifespan of your entire drivetrain system and improving overall RC vehicle performance.
- Safe-D5 Bore Design with D-Shaped Hole — The distinctive D-shaped bore matches the motor shaft profile precisely, preventing drive loss and brake failures if the set-screw accidentally backs out during operation. This safety-focused design is invaluable for RC drivers who demand reliability, as it eliminates the risk of losing power transmission at critical moments during races or high-speed runs.
- Suits 5mm Motor Shaft Diameter — Designed specifically for motors with a 5mm shaft, this pinion gear ensures a perfect fit with minimal play, providing secure engagement and reliable power transfer. The 5mm specification is one of the most common motor shaft sizes in the RC hobby, making this gear compatible with a broad range of popular RC motors and setups.
- Precision Manufactured Threaded Set-Screw Hole — The threaded M4 set-screw hole is machined with precision tolerance, ensuring the supplied set-screw threads securely and holds the gear firmly in place without slipping or loosening during operation. This precision engineering eliminates the frustration of loose pinion gears that can cause inconsistent power delivery.
- E-Clip Motor Shaft Retention — The included 3.2mm E-clip provides additional security for motor shaft pinion retention, working in conjunction with the set-screw to ensure the gear remains locked in position. This dual-retention system represents best-practice RC engineering, offering maximum security and reliability.
Technical Performance
The ARRMA 31T 0.8Mod Safe-D5 Pinion Gear represents the pinnacle of pinion gear engineering for serious RC enthusiasts. The 31-tooth configuration, combined with the 0.8 Module specification, delivers a carefully balanced gear ratio suitable for a wide range of RC motor setups and driving styles. The 0.8 Module pitch ensures smooth meshing with compatible spur gears, minimising backlash and maximising efficiency in power transmission. The steel construction provides exceptional durability compared to plastic or aluminium alternatives, making this gear ideal for high-torque motor applications and demanding racing environments. The Safe-D5 bore's D-shaped profile is specifically engineered to prevent gear slip, a common failure mode in RC cars and trucks where the set-screw backs out due to vibration. The precision manufacturing tolerances ensure consistent gear geometry, which translates to reduced vibration, smoother operation, and improved overall drivetrain efficiency. For UK RC enthusiasts running everything from 2WD buggies to 4WD trucks, this pinion gear delivers the kind of performance and reliability expected from ARRMA's professional-grade components.
What's in the Box
- 1 x 31T 0.8 Module Safe-D Pinion Gear (steel construction)
- 1 x Set Screw - M4 x 4mm (threaded)
- 1 x E-Clip - 3.2mm (motor shaft retention)
Frequently Asked Questions
- What motor shaft size does the ARRMA 31T 0.8Mod Safe-D5 Pinion Gear fit? — This pinion gear is designed specifically for motors with a 5mm shaft diameter, which is one of the most common motor shaft sizes in modern RC cars and trucks available to UK hobbyists. The Safe-D5 designation refers to the 5mm bore size.
- What makes the Safe-D5 design different from standard pinion gears? — The Safe-D5 features a distinctive D-shaped bore that matches the motor shaft profile, preventing the gear from spinning on the shaft if the set-screw becomes loose. This is a critical safety feature that prevents loss of drive and brakes during operation, making it ideal for competitive racing or demanding RC applications.
- Is this pinion gear suitable for high-speed RC cars? — Yes, the precision-engineered steel construction and carefully designed 31-tooth profile make this pinion gear suitable for a wide range of RC vehicles, from high-speed racing buggies to powerful brushless truck setups. The steel material provides the strength needed for high-torque motors common in performance RC cars.
- How does the 0.8 Module specification affect my RC setup? — The 0.8 Module (pitch) determines how the pinion gear meshes with your spur gear. This is a standard specification that ensures compatibility with a broad range of RC motors and drivetrain components. The 31-tooth configuration provides a balanced ratio suitable for both racing and recreational driving.
- What other components do I need to use this pinion gear? — You'll need a compatible RC motor with a 5mm shaft, a matching spur gear (also 0.8 Module), and a typical RC car or truck chassis. The set-screw and E-clip included with this gear are the only fastening components required.
- Will this pinion gear work with brushless and brushed RC motors? — Yes, this pinion gear is compatible with both brushless and brushed motors, provided they feature a 5mm shaft diameter. It's equally suitable for low-KV brushless setups and traditional brushed motors commonly used in RC cars and trucks across the UK market.
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 31T 0.8Mod Safe-D5 Pinion Gear Z-ARA311014 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.
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- 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.
