16 BLDC gearless hub motor. 100mm for front drive. 135mm for rear drive. 6 screw standard bike disc brake. 48v 350w (kindly please ask service center). 1 16 inch Hub Motor. If you choose the Kit, the packing list. 1 SW900 LCD display. A pair of Brake Lever (all black color). 1 set Disc Brake. 1 7 speed Freewheel Note: the front drive motor kit is can not the freewheel, the rear drive kit can use it. SW900 LCD display shows. Sw900 LCD display setting. P01: backlight brightness, level 1 is the darkest, level 3 is the brightest. P02: mileage unit, 0: KM; 1: MILE. P03: Voltage level: 24V, 36V, 48V, default 36V. P04: Sleep time: 0, no sleep; other numbers are sleep time, range: 1-60; unit minutes. P05: Power-assisted gear: 0, 3 gear mode: 1 gear 2V, 2 gear, 3V, 3 gear, 4V. 1, 5 gear mode: 1 gear 2V, 2 gear, 2.5V, 3 gear, 3V. 4 files, 3.5V, 5 files, 4V. P06: Wheel diameter: unit, inch; accuracy: 0.1. P07: Number of speed magnets: Range: 1-100. P08: Speed limit: range 0-50km/h, 50 means unlimited speed. P09: zero start, non-zero start setting, 0: zero start; 1: non-zero start. P10: Drive mode setting 0 : Power drive (the booster position determines how much power is output, and the switch is invalid). P11: Boost sensitivity setting Range: 1-24. P12: Boost start strength setting Range: 0-5. P13: Power magnetic steel disc type setting 5,8,12 magnetic steel three types. P14: Controller current limit value setting Default 12A Range: 1-20A. P15: The function has not been opened yet. P16: ODO clear setting Long press the up button for 5 seconds ODO clear. If you need other type throttle, feel free connect me. Suitable for the disc brake: 140mm with 6 holes. The 7 speed freewheel. (Only can use for rear drive motor).