... -250W high speed 4 Controller: 36V/48V Electric bicycle conversion kits 1. Charger: 36V/48V2. Wheel size: 20",26",28",or any ... ,brake bar,brake cables,switch bar,battery steel case,controller,charger etc7. Motor: 180W,250W,350W,500W,800W,1500W,2000W,etc ...