The Extrbici XC4000 adult electric bike has a high speed 500w motor. The 36v 16Ah high powered detachable lithium battery has super power and long life cycle. The distance that can be ridden with the battery is 55-75 miles in pedal assist mode. There is a Shimano brake and shift system for safety and efficiency. The tyres have shock absorbing front forks and are really stable so you get a comfortable ride. The aluminium alloy frame is light and easy to control and you can adjust the handlebars and saddle so that it is comfortable to ride for teenagers and adults.