itemmain partsdescriptionelectric SystembatteryLi-ion,36V 11AHmotor250W/350W,center ... "-21"Frame materialAluminum alloyFront forkSuntour,Aluminum alloy,with suspensionRimsAluminum alloySpokesstainless steelTyresKENDABrakesZoom,F/R:HydraulicstemAlloyGripsVeloSaddleSRSeat postAluminum ... wear, accidents, neglect, abuse or improper handling with the bike/ e-bike will invalidate your warranty ...