HPI 48P Pinion Gear 3.17mm Bore 28T Tooth CNC-machined Durable Steel HPI6927

The 6927 is engineered for smoothness and durability. In the world of 48P gearing, tooth profile is everything; HPI uses a specific geometry that ensures quiet operation and maximum surface contact with the spur gear. This reduces heat buildup and extends the life of your entire drivetrain.

Detailed Technical Specifications

1. High-Tensile Steel Construction

• Wear Resistance: Machined from durable steel to withstand the high RPMs of modern brushless motors. It resists "hooking" (where teeth become sharp and thin), ensuring consistent mesh over hundreds of battery packs.

• Balanced Rotation: CNC-machined for perfect concentricity. A pinion that is even slightly off-center creates vibration that can destroy motor bearings; HPI's 6927 ensures a true, vibration-free spin.

2. 3.17mm (1/8") Universal Bore

• Industry Standard Fit: Designed to fit almost all 540 and 550 sized brushed and brushless motors (such as those from Castle, Reedy, Hobbywing, and Tekin).

• Secure Locking: Includes a high-quality set screw (grub screw) that sits deep in the hub to prevent the pinion from sliding on the motor shaft during hard braking.

3. 48 Pitch (48P) Geometry

• Fine-Tooth Precision: 48P is preferred for 1/10 scale racing because it offers a finer adjustment of gear ratios compared to 32P. It provides a smoother "feel" and quieter drivetrain, which is essential for carpet and asphalt racing.

• Optimized Efficiency: The 28T size is a popular "middle-ground" gear, providing a significant speed boost over stock gearing while maintaining enough torque for punchy acceleration out of the corners.