Currie EZip Eco Ride Electric Bike 450 watt of power from a dc earth magnetic motor Lithium-ion removable battery pack for reduced weight, ease of use and longer life span Real transportation speeds up to 15mph (24 kilometer/hour) Patented currie electro-drive system, Shimano rear derailleur, sram grip shift, 7-speed drivetrain Suitable for young adult to adult, do not exceed 240 pounds (109 kilograms)