... 9 spockets 12-28''wheel,150-350w CCC,CE,ROHS,ISO9001 Let's make things better !electric bicycle conversion kit FOR EURPEAN MARKETBATTERYMOTOR ... SYSTEM 12"-28"700C25KG24v KIT 12"-28"700C7-10KG36v KIT 12"-28"700C7-10KG48v KIT 7-1OKG Electric system MotorFront wheel,light,high speed ...