- Manufacturer: ARRMA
- Model Number: AR310381
- Part Type: Transmission - Pinion Gear
- Tooth Count: 14T
- Gear Pitch: 48DP (Diametral Pitch)
- Bore Size: 3.2mm
- Material: Tough metal construction
- Precision manufactured for smooth gear mesh
- Included Components: 1 × Pinion Gear (14T, 48DP), 1 × Set Screw
- Vehicle Fitment: ARRMA GRANITE 4X4 RTR, ARRMA SENTON 4X4 RTR, ARRMA TYPHON 4X4 RTR, and related Mega 4x4 variants
Overview
The ARRMA Pinion Gear 14T 48DP is a premium-quality transmission component designed for the ARRMA Mega 4x4 range, including the popular GRANITE 4X4, SENTON 4X4, and TYPHON 4X4 models. Whether you're running a brushed monster truck, short course truck, or buggy, this pinion gear is essential for maintaining optimal power delivery and smooth acceleration. As an RC enthusiast in the UK, finding the right replacement or upgrade parts is crucial for keeping your RC car performing at its best, and this precision-engineered pinion gear from ARRMA delivers exactly that.
This high-quality pinion gear is manufactured from tough metal for maximum durability, ensuring it can withstand the demanding stresses of RC driving. The 14-tooth configuration works in harmony with your vehicle's spur gear to provide the correct gear ratio for balanced performance. If you're a serious RC hobbyist looking to maintain your ARRMA RC car UK setup or replace a worn component, this is the genuine OEM part you need. The precision engineering and robust construction make it a trusted choice for both casual weekend bashers and competitive RC drivers.
ARRMA has established itself as a leading manufacturer of high-performance RC vehicles, and their commitment to quality extends to every component, including transmission parts like this pinion gear. Choosing genuine ARRMA parts ensures compatibility, reliability, and longevity for your RC 4x4 vehicle. This pinion gear is an ideal upgrade path for anyone wanting to maintain their brushed monster truck or short course truck in top condition, or for those rebuilding their transmission system after heavy use.
Key Features
- 14-Tooth Configuration — The 14-tooth count is precisely engineered to work with ARRMA Mega 4x4 spur gears, delivering the optimal gear ratio for balanced speed and torque delivery across your RC car's acceleration range.
- 48DP Tooth Profile — The 48 diametral pitch tooth profile ensures precision-manufactured gear teeth that mesh smoothly with your spur gear, reducing noise, vibration, and wear for a more refined driving experience and extended component lifespan.
- Tough Metal Construction — Manufactured from high-quality metal material, this pinion gear is built to withstand the extreme forces and stresses encountered during aggressive driving, hard cornering, and rapid acceleration without stripping or deforming.
- Smooth Gear Mesh — The precision manufacturing tolerances guarantee perfect contact between the pinion teeth and your spur gear, creating smooth power transmission that minimises energy loss and maximises acceleration response.
- Genuine ARRMA Component — As an official ARRMA part (AR310381), this pinion gear meets the exact specifications and quality standards demanded by the manufacturer, ensuring perfect fitment and performance on compatible vehicles.
- Set Screw Included — The package includes a set screw for secure attachment to your motor shaft, eliminating the need to source fasteners separately and ensuring your pinion gear stays firmly in place during operation.
Technical Performance
This ARRMA Pinion Gear represents serious engineering designed specifically for high-performance RC transmission systems. The 48DP specification indicates a fine tooth pitch that allows for more teeth to be cut into a smaller diameter, resulting in smoother power delivery and reduced backlash compared to coarser pitch gears. The tough metal construction provides the rigidity and strength necessary to handle the powerful motor outputs of ARRMA's brushed and brushless vehicles without flex or deformation under load. The 14-tooth count is specifically calibrated for the Mega 4x4 platform's spur gear sizing, ensuring your transmission operates at the correct mechanical advantage—neither too high (which would limit top speed) nor too low (which would sacrifice acceleration). The precision manufacturing process creates gear teeth with tight tolerances, allowing the pinion to mesh perfectly with your spur gear for smooth, efficient power transmission. This is particularly important in demanding RC applications where worn or poorly manufactured gears create lost motion, increased friction, and premature wear on your entire drivetrain. Whether you're pushing your brushed monster truck to its limits on tight technical courses or running high-speed bashing sessions, this pinion gear provides the durable, reliable performance that ARRMA vehicles are known for across the RC community in the UK.
What's in the Box
- 1 × Pinion Gear (14T, 48DP)
- 1 × Set Screw
Frequently Asked Questions
- What ARRMA vehicles is this pinion gear compatible with? — This 14T 48DP pinion gear is a standard component for the ARRMA Mega 4x4 range, fitting models including the GRANITE 4X4 RTR (both standard and Boost 2WD versions), SENTON 4X4 RTR short course truck, and TYPHON 4X4 RTR buggy. It serves as either a standard part or optional replacement component depending on your specific model variant.
- How do I know if I need to replace my pinion gear? — Signs that your pinion gear needs replacement include visible tooth wear or chipping, grinding noises during acceleration, difficulty engaging power smoothly, or slipping sensations during driving. If your RC car's transmission feels loose or imprecise, examining your pinion gear for wear is a good diagnostic step. A new pinion gear often improves overall drivetrain feel and responsiveness.
- What is the difference between 48DP and other diametral pitch specifications? — The 48DP specification refers to the gear tooth pitch—specifically, 48 teeth per inch of diameter. Higher DP numbers like 48DP create finer teeth than lower pitch gears (such as 32DP), resulting in smoother mesh, less backlash, and quieter operation. This makes 48DP pinions ideal for precision RC applications where smooth power delivery is important.
- Do I need any tools to install this pinion gear? — Installation requires a means of securing your motor shaft so you can slide the pinion gear onto the shaft and tighten the included set screw. Most RC enthusiasts use a motor tool or a vice with soft jaws. You'll need an appropriate hex key or wrench to tighten the set screw firmly, ensuring the gear cannot slip during operation.
- Is this suitable for beginners working on their own RC car? — Yes, this is a straightforward replacement part suitable for anyone with basic mechanical skills. If you're comfortable removing your motor from your RC chassis and have access to basic tools, replacing a worn pinion gear is an achievable maintenance task. However, if you're unsure about motor removal or installation, many RC shops in the UK offer fitting services.
- How often should I replace my pinion gear? — With normal use, a quality metal pinion gear like this ARRMA component can last many months or even years. However, if you drive aggressively, run frequently, or notice any signs of wear, replacement every 6-12 months is reasonable. Inspection during routine maintenance helps you catch wear early before it damages your spur gear.
- What is a set screw and why is it included? — The set screw is a small fastener that secures the pinion gear to your motor shaft, preventing it from slipping or rotating independently. Tightening it firmly after installation ensures positive engagement, which is critical for reliable power transmission and safety during operation.
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 Pinion Gear 14T 48DP: Mega 4x4 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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