... ,RoHS DIY electric bicycle wheel kits Electric bike kit 12-28"wheel,24-48V CE,CCC,EN15194,RoHS Electric systemMotor: Front wheel,light,high speed ... ,brushlessGreat hub motor,16inch 28inch wheel optional.DISC brake optionalBattery: 24V/10Ah 36V-10AH,36V-8Ah polymer li-ionAll battery ... )Max speed:25km/h(Eur) 32km/h(USA&Canda) DIY electric bicycle wheel kit