The Serfas Dart represents affordable entry into the e-bike market while offering plentiful power, range, and comfort. - Pedal Assist: 28mph - Throttle: 20mph (Class 3) - Motor: 500W Nominal, 750W Peak, Brushless, Rear Hub Motor - Pedal Assist: 5 Levels - Range: 30 Miles - Battery: 54V Peak, 48V Sustained, 11.6Ah Samsung 556.8Wh - Frame: Double-Butted 6061 Heat-Treated Aluminum Alloy - Tires: Kenda Kwick Seven.5 Sport 27.5 x 2.20 KS E-Bike 50 - Handlebar: Aluminum, 31.8mm 15 Degree Sweptback - Saddle: Serfas City Bike 300 - Brake: Tektro HD-T285 180mm Hydraulic Disc Brake - Front Hub: Novatec 36H Disc, Nutted - Rim: Double Wall 36H Front and Rear, Disc Only - Shifter: Shimano 8S Altus Rapidfire, Shimano 8S Altus Rear Derailleur - Cassette: Shimano Altus 11-36 Cassette, 8 Speed