This steel 18-tooth pinion is a direct-fit replacement intended for HPI Baja models, supplied as 1pc. The gear features a 5mm bore and a regraded tooth profile to match stock spur geometry or the SBJ057T option without altering the original gearbox layout.
Use this pinion when you need a straightforward drivetrain swap or when tuning final drive ratios for traction and acceleration. Because it is steel, the component is aimed at routine maintenance and track use where gear wear and consistent mesh are considerations.
Installation notes: fit the pinion onto the motor shaft ensuring the bore seats fully, set mesh to a manufacturer-recommended clearance, and tighten the set screw securely while avoiding excessive torque that can damage the motor shaft or gear teeth. Check mesh after a short test run and re-torque if needed.
This part is sold as 1pc and is intended for RC-scale applications only.
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