The Serfas Dart represents affordable entry into the e-bike market while offering plentiful power, range, and comfort. Speed: Pedal Assist: 20 mph Throttle: 20 mph, Thumb Throttle (Class 2) Motor: BafangA(R) 350W 36V Brushless Rear Hub Motor Pedal Assist: 5 Levels Range: 30 Miles Battery: Lithium-ion 36V, 12.4Ah (446.4Wh) w/ LGA(R) Cells Frame: 6061 Double-Butted Aluminum Alloy w/ Internal Battery Tires: KendaA(R) Kwick Seven-5 Sport 27.5 x 2.2 Handlebar: Zoom VLG-649 Aluminum 31.8, 15-Degree Sweptback Brakes: TektroA(R) MD-M280 Mechanical Disc w/ 180mm Rotors Shifter: ShimanoA(R) 7-Speed SL-M315 Derailleur:ShimanoA(R) RD-TY300D 7-Speed Weight: 64lbs