bafang 48v 500w hub motor rear wheel electric bike conversion kit kinds of bicycle 20"26" 27.5" 700c rear wheel

diy rear wheel ebike conversion kit for bicycle with rear drop out size "128 to 148 mm" flywheel below 9 speeds.compatible with the disc brake, has a rated power of 500w, providing ideal power for vehicles. greatly enhances riding comfort and is suitable for touring bikes, commuter bikes and mountain bikes.