... bike kit 12-28"wheel,24-48V CE,CCC,EN15194,RoHS DIY electric bicycle wheel kits Electric bike kit ... 12-28"wheel,24-48V CE,CCC, ... ,RoHS Electric systemMotor: Front wheel,light,high speed,brushlessGreat hub motor,16inch 28inch wheel optional.DISC brake optionalBattery: ... 25km/h(Eur) 32km/h(USA&Canda) DIY electric bicycle wheel kit