AXIAL AX30724 Pinion Gear 32P 13T Steel 3mm Motor Shaft Steel Spur Gear For Torque And Speed Tuning Axial AX30726 Pinion Gear 32P 15T 3mm Steel Sprocket Features: Extra hard high carbon construction; For use with the Robinson Racing GEN3 steel slipper units; 5mm Bore Fits 5mm motor shaft... Axal's new 32P steel sprockets for the EXO Terra Buggy give you a range of gear options to refine torque and top speed. OGRC Steel Hardened 32P Pinion Gears 10T 11T 12T 13T 14T 3.175mm Shaft for Traxxas Powder steel construction for durability Includes two adjustment screws per pack Compatible with 32P spur gears Stamped tooth count for easy identification Fits 3mm motor shafts - more information on request.