48V 250W Bafang Mid Drive Motor. With an integrated speed sensor, this mid-drive motor, which is compatible with standard bikes, has a rated power of 250W, a reduction ratio of 1: 21.9 and a maximum torque of 80 N. M, providing ideal power for vehicles. Light but strong and efficient, this motor greatly enhances riding comfort and is suitable for touring bikes and commuter bikes. Wheel Diameter (Inch): Optional. Rated Voltage (DCV): 48. Rated Power (W): 250. Efficiency (%):? 80. Weight (kg): 3.8. Light Drive Capacity (DCV / W): 6 /3(max). Speed Detection Signal (Pulses/Cycle):1. Reduction Ratio:1:21.9. Magnet Poles (2P): 16. Salt Spray Test Standard(h): 96. Hailong 48V 13Ah Specification. Battery Cell:Built in 18650 2600mAh. Battery Weight:4.1KG. Max Constant Discharge Current:25A. Charge voltage:54.6V. Discharge cut off voltage:36.4V. Way of Charge:CC/CV. Cycle Life:1000 times. Protection Function:Over charge, Over discharge, Over current, Short circuit, Balance. Hailong 48V 17.5Ah Specification. Rated Capacity:17.5AH. Battery Cell:Built in Samsung / LG / Panasonic 18650 3500mAh. Battery Weight:4.4KG. Max Constant Discharge Current:30A. Battery cell:LG / Samsung 21700 5000mAh. Array mode:13S4P 52pcs. Operating Voltage:36.4V54.6V. Constant Voltage:2A unit 54.6V. Standard Charge Current: 4A. 1 48V 250W Mid Drive Motor. 1 Pair Crank Arms. 1 Set Thumb Throttle. 1 Set Speed Sensor. 1 4 in 1 Cable. 1 set Lock nuts. 1 XT60 battery extension cable. 1 install accessories for 73mm bottom bracket (Free gift). 1 6V headlight (Free gift). 1 wrench tool (Free gift). 2 36V 250W stickers (Free gift). 1 battery& Eruope charger (optional). Note:If you choose”No battery”, there is no battery comes with the motor kits. Which bike can use this motor kits? Bottom Bracket Width shall be 68-73mm, fit almost 99.99% bike on the market. What is the max voltage this motor can handle?