Overview
The ARRMA 28T 0.8Mod Safe-D5 Pinion Gear (Z-ARA311011) is an essential replacement and upgrade component for RC enthusiasts running ARRMA 1/8 scale vehicles. This precision-engineered steel pinion gear is built to deliver reliable performance in demanding RC conditions, whether you're pushing your RC car UK model to its limits on the street or taking it through extreme bashing sessions. As a critical drivetrain component, a quality pinion gear is fundamental to maintaining smooth power delivery, consistent acceleration and overall vehicle performance across all driving styles.
Designed specifically for ARRMA's Street Bash lineup including the INFRACTION 223S DSC 4X4 RTR models, this pinion gear represents the kind of OEM-quality replacement parts that serious RC car enthusiasts keep in their toolkit. The 28-tooth configuration paired with 0.8 Module pitch provides the right balance of speed and torque characteristics for street bashing applications. Whether you're a seasoned RC competitor, a weekend basher, or discovering the world of high-performance RC vehicles for the first time, having quality spare drivetrain parts ensures your model stays in peak running condition and ready for action whenever you are.
The Safe-D5 design philosophy sets this component apart from standard pinion gears, offering safety features that protect against common failures that can occur during intense RC driving. This makes it an ideal choice for RC car enthusiasts across the UK who demand reliability and durability from their components.
Key Features
- Strong and Durable Steel Construction — Manufactured from tough steel, this pinion gear is engineered to withstand the extreme stresses and impacts of RC driving, ensuring long-lasting performance even during aggressive bashing sessions and competitive racing. The robust material selection means the gear resists stripping, cracking and deformation that can occur with lower-quality alternatives.
- Precision Manufactured Wide Tooth Profile — The carefully engineered tooth geometry delivers smooth meshing with the spur gear, reducing vibration and noise whilst maximising power transfer efficiency. This precision manufacturing translates directly to smoother acceleration, more predictable handling characteristics and extended component lifespan compared to poorly machined alternatives.
- Safe-D5 Design with D-Shaped Bore — The distinctive D-shaped hole matches your motor shaft profile precisely, providing a mechanical lock that prevents drive loss and brake engagement failure even if the set-screw backing out. This innovative safety feature eliminates the risk of your vehicle losing power mid-run or experiencing unexpected brake engagement, which is critical for both competitive racing and casual bashing.
- 5mm Motor Shaft Compatibility — Designed to fit 5mm diameter motor shafts, this pinion gear works seamlessly with the motor specification used in ARRMA INFRACTION 223S DSC 4X4 RTR vehicles, ensuring perfect fit and optimal power transmission without modification.
- Precision Threaded Set-Screw Hole — The carefully manufactured threaded hole accepts the included M4x4mm set-screw, allowing secure fastening to your motor shaft with the confidence that the threads will hold reliably through countless drive cycles and extreme conditions.
- E-Clip Motor Shaft Retention — An included 3.2mm E-clip provides additional shaft retention, working in conjunction with the set-screw to ensure your pinion gear stays firmly mounted even under extreme acceleration and cornering forces.
Technical Performance
This 28-tooth, 0.8 Module pinion gear represents the pinnacle of OEM replacement component engineering for ARRMA 1/8 Street Bash vehicles. The 0.8 Module pitch specification ensures compatibility with standard ARRMA spur gears while the 28-tooth count provides the optimal balance between top speed and acceleration response for street-based driving. The steel construction offers superior wear resistance compared to plastic alternatives, meaning your investment in this component will pay dividends through extended service life and consistent performance. The precision manufacturing process ensures tight tolerances throughout, eliminating the slop and backlash that can develop in lower-quality gears and lead to poor handling characteristics or drivetrain noise. For RC car enthusiasts across the UK seeking professional-grade replacement parts, this pinion gear delivers the quality and reliability expected from an authorised ARRMA component. The Safe-D5 bore design is particularly noteworthy, as it fundamentally changes how the gear interacts with your motor shaft — rather than relying solely on the set-screw to transmit power, the D-shaped profile creates a mechanical lock that's virtually impossible to overcome through accidental loosening.
What's in the Box
- 1 x 28T 0.8 Module Safe-D5 Pinion Gear
- 1 x Set Screw M4 x 4mm
- 1 x E-Clip 3.2mm
Frequently Asked Questions
- What is the Safe-D5 design and why does it matter for my RC car? — The Safe-D5 designation refers to the D-shaped bore that matches your motor shaft, creating a mechanical lock that prevents power loss if the set-screw backs out. This is a critical safety feature for RC enthusiasts because it eliminates the risk of your vehicle suddenly losing drive or experiencing unexpected brake engagement during a run, which could result in your RC car UK model becoming damaged or lost.
- Is this pinion gear suitable for competitive racing or only casual bashing? — This is a professional-grade OEM component used in ARRMA's official INFRACTION 223S DSC 4X4 RTR Street Bash models, making it equally suitable for both competitive racing and aggressive casual bashing. The precision manufacturing and durable steel construction ensure consistent performance whether you're competing in organised events or pushing your RC car to its limits at the local bash spot.
- What motor shaft size does this pinion gear fit? — This gear is specifically designed for 5mm diameter motor shafts, which is the standard specification used in ARRMA INFRACTION 223S DSC 4X4 RTR vehicles. Ensure your motor shaft matches this diameter before purchasing, as a 5mm bore will not fit other shaft sizes.
- How do I install this pinion gear on my RC vehicle? — Installation involves sliding the gear onto your 5mm motor shaft, ensuring the D-shaped bore aligns with the D-shaped portion of your motor shaft. Then insert the supplied M4x4mm set-screw through the threaded hole and tighten securely, before fitting the 3.2mm E-clip to the motor shaft for additional retention. The combination of D-shaped bore, set-screw and E-clip creates a secure assembly that won't come loose during driving.
- What ARRMA models is this pinion gear compatible with? — This pinion gear is officially compatible with the ARRMA 1/8 INFRACTION 223S DSC 4X4 RTR Street Bash models, specifically the Blue/Red (C-ARA4315V4T1), Teal/Pink (C-ARA4315V4T3) and Red/Black (C-ARA4315V4T2) variants. If you own one of these models, this is the correct OEM replacement pinion gear.
- Why should I choose this over a cheaper alternative pinion gear? — OEM ARRMA components like this pinion gear are engineered and tested to work perfectly with your specific vehicle model, ensuring proper gear mesh, optimal power delivery and long-term reliability. Cheaper non-OEM alternatives may have tolerance issues, inferior material quality or incompatible bore specifications that compromise performance and component lifespan.
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 28T 0.8Mod Safe-D5 Pinion Gear Z-ARA311011 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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