... coverPedals: Plastic body and cage, 9/16"Crank Set: Stee, CP cranks, 42T*170mm,TxedBB Set: Steel, semi-cartridgeGear Set: SHIMANO ... -50 6-speedF/R hubs: Front steel CP hub motor, rear alloy hub motorSpokes: steel, CP.Rims: 700C alloy double wall, silverTires ...