PAS SENSOR: Speed sensor. Reduction Ratio: 1:21.9. 1 Mid Drive Motor 1 Display (Optional, if you choose no display, the parcel will not include) 1 Thumb throttle 1 Cranks 1 44T Chainring 1 Speed sensor 1 Brake levers or brake sensor 1 1T4 cable 1 Screw and Nut Accessories Set 1 Headlight 1 Wrench 1 36V250W sticker 1 Crank Puller 1 Bottom Bracket Remover 1 User Manual. Note: The motor is designed to fit bottom brackets with a width of. And an inner diameter of. Please note that the motor kit does not include screws for 73mm bottom bracket.