... bicycle kits covers:1) A:motor with doublewall rim DC 36V, 150W, 250W, 300W; DC 48V, 150W, 350W, 500W. front and rear wheel ... motor are both available (100mm and 135mm for forks) for bolted disc brake and geared freel wheel designB ... :electric brake (save version) All parts get CE approval Electric bicycle kits' fetures 2) Waterproof high density sealant, sealant ring3) ...