- Manufacturer: ARRMA
- Part Number: Z-ARA311053
- EAN: 5052127038966
- Product Type: Pinion Gear
- Number of Teeth: 13
- Gear Pitch: Mod 1
- Bore Diameter: 5mm
- Hole Design: Safe-D5 D-shaped
- Material: Steel
- Motor Shaft Compatibility: 5mm diameter
- Set-Screw: M4 x 4mm (included)
- E-Clip: 3.2mm (included)
- Tooth Profile: Wide precision manufactured profile
- Recommended Use: RC cars with 5mm motor shafts
- Included Accessories: Set screw, E-clip retention
Overview
The ARRMA 13T Mod1 Safe-D5 Pinion Gear Z-ARA311053 is an essential replacement and upgrade component for RC enthusiasts running ARRMA vehicles with 5mm motor shafts. Whether you're a dedicated basher, weekend racer, or serious RC competitor in the UK, having quality pinion gears in your RC tool box is crucial for maintaining peak performance and reliability. This tough steel pinion gear is precision manufactured to exacting standards, ensuring smooth operation and long-lasting durability even in the most demanding RC conditions.
The Safe-D5 pinion gear features ARRMA's innovative D-shaped hole design, which represents a significant advancement over traditional round-hole pinions. This unique profile matches your motor shaft geometry precisely, providing a mechanical lock that prevents drive loss and brake failure if your set-screw accidentally backs out during intense driving sessions. For anyone running an RC car in the UK with a 5mm motor shaft, this is the pinion gear upgrade that serious hobbyists choose for peace of mind and consistent performance.
Designed specifically for the Mod1 gear pitch with 13 teeth, this pinion delivers the perfect balance of torque and top speed characteristics that ARRMA vehicles are renowned for. The wide tooth profile ensures smooth meshing with your spur gear, reducing noise, minimising stress on drivetrain components, and extending the lifespan of your entire transmission system.
Key Features
- Strong and Durable Steel Construction — Manufactured from high-quality steel, this pinion gear delivers long-lasting performance even when subjected to the extreme forces and impacts typical of RC car driving, whether you're bashing through rough terrain or pushing hard on the track.
- Precision Manufactured Wide Tooth Profile — The carefully engineered wide tooth profile ensures smooth operation and efficient power transfer from motor to spur gear, reducing vibration and noise whilst maintaining maximum drive efficiency.
- Safe-D5 D-Shaped Hole Design — The distinctive D-shaped hole matches your motor shaft profile exactly, creating a mechanical lock that prevents drive loss and brake failure even if your set-screw backs out during intense driving, giving you complete confidence in your RC setup.
- 5mm Motor Shaft Compatibility — Engineered to suit 5mm diameter motor shafts, this pinion integrates seamlessly with popular ARRMA RC cars and compatible brushless motors commonly found in UK RC hobby shops.
- Precision Manufactured Threaded Set-Screw Hole — The accurately machined hole accepts the included M4 x 4mm set-screw, ensuring a tight, secure fit with no slipping or movement under load.
- E-Clip Retention System Included — The supplied 3.2mm E-clip provides additional motor shaft pinion retention, working together with the set-screw to keep your pinion firmly in place during all driving conditions.
Technical Performance
The ARRMA 13T Mod1 Safe-D5 Pinion Gear represents a significant step forward in drivetrain reliability and performance for RC vehicles equipped with 5mm motor shafts. With 13 teeth and a Mod1 gear pitch, this pinion is engineered to deliver smooth, efficient power transmission from your brushless motor to the main spur gear, maintaining consistent acceleration characteristics and minimising strain on drivetrain components. The steel construction provides superior durability compared to plastic alternatives, maintaining tooth profile integrity even after extended use and harsh impacts. The wide tooth profile design reduces contact stress and distributes load more evenly across each tooth, directly extending gear life and improving overall drivetrain longevity. The innovative Safe-D hole design is a game-changer for RC hobbyists who demand reliability; by mechanically locking the pinion to the motor shaft with a D-shaped interface, ARRMA has effectively eliminated one of the most frustrating failure modes in RC cars — the loss of drive or brake function caused by a loose set-screw. This is particularly valuable for competitive drivers and serious bashers who cannot afford downtime or unexpected failures during important driving sessions.
What's in the Box
- 1 x 13T Mod1 Safe-D Pinion Gear
- 1 x Set Screw M4 x 4mm
- 1 x E-Clip 3.2mm
Frequently Asked Questions
- What does the Safe-D5 design do differently from standard round-hole pinion gears? — The D-shaped hole in the Safe-D5 pinion matches your motor shaft profile precisely, creating a mechanical lock that prevents your pinion from losing drive or brake function if the set-screw backs out during driving. This is a major safety feature that standard round-hole pinions cannot match, making it the preferred choice for serious RC enthusiasts in the UK who demand reliability.
- Is this pinion gear compatible with my ARRMA RC car? — This 13T Mod1 Safe-D5 pinion gear is designed for ARRMA vehicles that use 5mm diameter motor shafts. Check your vehicle's specifications to confirm 5mm motor shaft compatibility. If you're unsure, our team at RC Model Shop can help you identify the correct pinion for your specific model.
- What is the difference between this 13T gear and other tooth counts available? — The tooth count directly affects your vehicle's speed and torque characteristics. A 13T pinion provides a specific gear ratio that ARRMA has engineered for balanced performance. If you want higher top speed, you might consider a higher tooth count; for more torque and acceleration, a lower tooth count is available. The 13T represents ARRMA's recommended setup for most driving conditions.
- Do I need both the set-screw and the E-clip? — Yes, both retention methods work together to keep your pinion secure. The set-screw provides the primary retention, while the E-clip offers additional backup retention on the motor shaft. Using both ensures maximum security and prevents any possibility of pinion slippage during hard driving.
- How often should I replace my pinion gear? — Pinion gear lifespan depends on driving frequency, style, and conditions. Inspect your pinion regularly for tooth wear or damage. If you notice worn, chipped, or broken teeth, replacement is necessary. Many RC hobbyists carry spare pinions in their tool box for quick track-side replacements during competition or long driving sessions.
- Is this pinion suitable for both racing and bashing? — Absolutely. The steel construction and Safe-D design make this pinion ideal for all driving styles. Whether you're pushing hard on the track, competing in organised events, or bashing through rough terrain for fun, this pinion delivers the durability and reliability you need.
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 13T Mod1 Safe-D5 Pinion Gear Z-ARA311053 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.
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