Electric bicycle conversion kits: wheel:26" volt and power:36v-48v/180w-500w Max Efficiency>80% more info,please welcome us Electric bicycle conversion kits:1) Rated voltage: DC24, 36V, 48V 2) Rated:Power: 250W, 350W, 3) Max Efficiency:≥82% 4) Wheel Size: 20"-26''5) RPM: 300rpm.. CE-approved 26" electric bicycle conversion kits