The 16-tooth steel pinion with a 5mm bore SBJ016TO uses a regraded tooth profile optimised for HPI Baja platforms. It is offered as an aftermarket steel pinion that will mesh with the stock spur gear or SBJ057T and serves as a direct steel swap where greater wear resistance is wanted.
Fitting is straightforward: push the pinion onto a 5mm motor shaft, align mesh to the spur gear, then secure the set screw. Confirm proper backlash and tooth contact visually and rotate the drivetrain by hand to ensure smooth engagement; the regraded profile helps with initial tooth contact but final mesh should follow your chassis guidelines. Supplied as 1pcs.
Swapping tooth counts changes acceleration versus top speed, while this 16T steel choice focuses on durability and consistent mesh behaviour compared with softer pinions. Choose this part when you want a rugged replacement compatible with the stock spur gear or SBJ057T.
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