itemmain partsdescriptionelectric SystembatteryLi-ion,36V 11AHmotor250W/350W,center motorDisplayLCDPAS Modes5 leveleslight(F/R)F:LED,R:LED,DINSensorTorque SensorPerformanceMax speed40kmsCharging time6-8 hoursvehicle specificitonsDerailleurShimano outer 8 speedWheel size700cFrame size18"-21"Frame materialAluminum alloyFront forkSuntour,Aluminum alloy,with suspensionRimsAluminum alloySpokesstainless ...