This is the Robinson Racing Xtra Hard 5mm Bore Steel 14-Tooth 1.0 Module Pinion Gear. This works in brushless setups for the Traxxas Revo 2.5, 3.3, and T-Maxx 3.3, and it also works with most 1/8 scale brushless conversions for Associated, Losi, HPI, Ofna, Jammin, and Kyosho.
Includes:One 14 tooth pinion gearOne 4x4mm set screw
Requires: Installation onto the motor shaft
Specifications:Length: .48" (12.15mm)Mounting hole diameter: 5mm
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