AKM Gear set for Q100 motor / AKM-100 36V 250W gear set for replacement AKM motor gear for 26inch, 20inch,16inch motor 1. Gear set for Q100 36V 250W front or rear motor, AKM-100 36V 250W front or rear motor 2. Please according your motor parameter choose the gear,different RPM, gear set is different. 3. 39T+27T is for AKM-100 front motor 26inch=201; AKM-100 rear motor 16inch=328; AKM-100 front or rear motor 20inch=260 39T+23T is for AKM-100 rear motor 26inch=201 36T+23T is for AKM-100 front motor 16inch=328 Please check it your original gear set before you order. (In order to know exactly which gear is used for AKM motor , must need to know the info. of the RPM,only this way can fit the right gear to match the motor type. Those AKM gears that are not classified or labeled for general use are unprofessional ) Packing list: one set gear3PCS