... 6 gears lithium battery powered bike Tech Specification for Electric Mountain Bike:Electric System Motor: light-weight ... -TX51Handle Bar: Zoom, Aluminum alloy, ZoomStem: Zoom, Aluminum alloy, adjustable ZoomBrake Lever: Aluminum alloy with power off switch ... resistant chainChain Wheel: Alloy 44T, aluminum alloy crankMudguard: PP PlasticRear Rack: Aluminum alloySaddle: Soft confortablePedeal: City style ...