ARRMA Spur Gear 91T 48dp Transmission for RC Car ARA311030

• Part Type: Spur Gear (Transmission Component)
• Tooth Count: 91T
• Tooth Profile: 48 Diametral Pitch (48dp)
• Material: Molded composite
• Quantity Included: 1 x Spur Gear
• Compatible Slipper Pad: ARA310994 Slipper Pad (4-piece set) required
• Slipper Pad Type: Single castellated slipper pad design
• Compatible Models: ARRMA Granite 4X4 RTR, ARRMA Granite Boost 2WD RTR, ARRMA Senton 4X4 RTR Short Course Truck, ARRMA Senton Boost 2WD RTR, ARRMA Vorteks Boost 2WD RTR Stadium Truck, ARRMA Typhon 4X4 RTR 1/8 Buggy
• Manufacturer: ARRMA
• ARRMA Part Number: ARA311030
• EAN Code: 5052127037693
• Spare Part Category: Drivetrain / Transmission

Overview

The ARRMA Spur Gear (91T, 48dp) is a precision-engineered replacement transmission component designed for serious RC enthusiasts who demand reliable performance from their RC cars. Whether you're running an ARRMA 1/10 scale monster truck, short course truck, stadium truck, or 1/8 buggy, this high-quality spur gear delivers the dependable engagement and durability you need for consistent bashful running or competitive racing. As an authorised ARRMA spare part, this spur gear is manufactured to exact OEM specifications and is trusted by RC hobbyists across the UK who rely on genuine ARRMA components to keep their models performing at peak efficiency.

If you're experiencing worn gear teeth, inconsistent power delivery, or simply want to upgrade your transmission setup on your brushed RC truck or buggy, this 91-tooth spur gear with 48dp profile offers the precision-engineered solution you need. RC car UK enthusiasts have come to trust ARRMA's commitment to quality, and this component exemplifies that dedication to durability and performance. The gear is constructed from tough molded composite material that resists wear whilst maintaining smooth engagement with your pinion gear, making it an essential spare for weekend bashers and competitive drivers alike.

This replacement spur gear is an ideal upgrade path when you're looking to fine-tune your RC model's gearing or simply replace a worn component. The 91-tooth configuration provides a specific gear ratio that's optimised for the models listed in ARRMA's fitment database, ensuring you get the exact performance characteristics ARRMA engineers intended for your particular model.

Key Features

• Precision Manufactured Gear Teeth — Each tooth on this spur gear is precision manufactured to ensure smooth, consistent performance during acceleration and top speed running, eliminating the chatter and grinding associated with worn or poorly manufactured gears that can prematurely damage your transmission.
• Tough Molded Composite Material — Constructed from durable composite material rather than brittle plastic, this gear resists impact damage and wear, ensuring longer lifespan even under the demanding conditions of off-road RC bashing and racing.
• Industry Standard 48dp Tooth Profile — The 48 diametral pitch (48dp) tooth profile is an industry standard specification that ensures perfect meshing compatibility with pinion gears designed to the same specification, guaranteeing smooth power transfer with minimal backlash.
• 91-Tooth Configuration — The 91-tooth count establishes a specific gear ratio that's calibrated for optimal performance on compatible ARRMA models, affecting acceleration, top speed, and motor load characteristics.
• Designed for Single Castellated Slipper Pad — This spur gear is engineered to work with a single castellated slipper pad (sold separately as ARA310994), which provides superior engagement compared to standard slipper pads and ensures more dependable operation during hard acceleration and cornering.
• Castellated Slipper Pad Compatibility — The castellated design of the compatible slipper pads offers better mechanical engagement with the spur gear, reducing slip during aggressive driving and providing more direct power delivery to the wheels.
• Genuine ARRMA OEM Component — As an official ARRMA spare part, this gear is manufactured to exact factory specifications and backed by ARRMA's reputation for quality, giving you confidence that your transmission will perform as intended.

Technical Performance

The ARRMA Spur Gear (91T, 48dp) represents the pinnacle of transmission engineering for 1/10 and 1/8 scale RC vehicles. With 91 teeth machined to industry standard 48dp specifications, this gear delivers the precision engagement required for consistent power delivery across the entire RPM range of brushed and brushless motors. The molded composite construction provides an ideal balance between durability and weight savings—tough enough to withstand the shock loads of off-road bashing, yet light enough not to add unnecessary rotational inertia to your transmission. The gear's precision manufacturing ensures minimal runout and backlash when meshed with a properly aligned pinion gear, which is essential for smooth acceleration, reliable top speed performance, and extended drivetrain component lifespan. Whether you're running your ARRMA Granite, Senton, Vorteks, or Typhon over rough terrain, this spur gear maintains consistent engagement with your slipper pad, preventing wheel spin and ensuring predictable handling characteristics. The inclusion of the castellated slipper pad system (which requires the separate ARA310994 pad set) elevates this transmission design above standard offerings, providing superior slip characteristics that allow precise throttle control and more predictable cornering behaviour. UK RC car enthusiasts will appreciate the engineering rigour ARRMA applies to even seemingly simple components like transmission gears—every tooth profile, every material choice, and every design decision is made to maximise durability and performance.

What's in the Box

• 1 x ARRMA Spur Gear (91T, 48dp)

What You Need to Complete

• ARA310994 — ARRMA Slipper Pad (4-piece set) — required for proper spur gear operation

Compatible ARRMA Models

This spur gear is a standard parts fitment for the following ARRMA ready to run RC models: ARRMA 1/10 Granite 4X4 (ARA4202XV3 and ARA4202V3), ARRMA 1/10 Granite Boost 2WD (ARA4102V4 and ARA4102SV4), ARRMA 1/10 Senton 4X4 Short Course Truck (ARA4203XV3 and ARA4203V3), ARRMA 1/10 Senton Boost 2WD (ARA4103V4 and ARA4103SV4), ARRMA 1/10 Vorteks Boost 2WD Stadium Truck (ARA4105V4 and ARA4105SV4), and ARRMA 1/8 Typhon 4X4 brushed buggy (ARA4206V3). If you own any of these models, this is the genuine replacement spur gear specified in your user manual.

Frequently Asked Questions

• What does the 91T and 48dp specification mean? — The 91T indicates this spur gear has 91 teeth, whilst 48dp refers to the diametral pitch (tooth profile fineness). This specification determines how the gear meshes with your pinion gear and affects your model's overall gear ratio, acceleration curve, and top speed. These specifications must match your pinion gear for proper operation.
• Will this spur gear fit my ARRMA RC truck? — This gear is a standard parts fitment for multiple ARRMA 1/10 and 1/8 scale models including the Granite, Senton, Vorteks, and Typhon. Check the compatible models list above or consult your model's user manual to confirm fitment. If your model is listed, this is the correct replacement gear.
• Do I need to replace my pinion gear when I replace the spur gear? — Whilst not always necessary, it's good practice to inspect your pinion gear for wear when replacing the spur gear. If your pinion shows signs of wear or damaged teeth, replacing both gears simultaneously will ensure optimal meshing and transmission longevity.
• What is a castellated slipper pad and why does it matter? — A castellated slipper pad features a notched design that provides superior mechanical engagement with the spur gear teeth compared to standard smooth slipper pads. This design reduces unwanted slipping during hard acceleration and cornering, giving you more predictable throttle response and better traction control.
• How often should I replace my spur gear? — Spur gear lifespan depends on driving intensity and maintenance. Casual bashers may get 20-30 hours of use before replacement, whilst competitive drivers might need to replace gears more frequently. Inspect your gear regularly for chipped or worn teeth, and replace when you notice deterioration in engagement or performance.
• Is this suitable for beginners? — This is a replacement spare part designed for users who already own a compatible ARRMA model. If you're just starting your RC hobby, you'll first want a ready to run RTR kit. Once you have your model running, keeping spare transmission gears on hand is a smart investment for uninterrupted fun.
• What makes ARRMA spur gears better than aftermarket alternatives? — ARRMA original equipment manufacturer (OEM) gears are engineered and tested specifically for your model's motor, ESC, and transmission system. They're precision-manufactured to exact specifications, ensuring perfect fitment and reliable performance. Choosing genuine ARRMA spares guarantees compatibility and durability.

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 Spur Gear (91T,48dp) Z-ARA311030 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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