ninecontinent electric bicycle conversion kits 1:36-48-60v 250-350-500-800w 2:dropout:100mm 3:bike dics brake Electric bicycle conversion kit cover:1) ... A:motor with doublewall rim DC 36V, 150W, 250W, 300W; DC 48V, 150W, 350W, 500W. front and rear ... 800sets for 40GPdeliverytime:15daysminimum order:50sets by sea electric bicycle kit,bicycle conversion kits