Serfas eDASH Plus 500 MID Electric Bicycle. Specs Frame 6061 Double-Butted Folding Aluminum Alloy, with Internal Battery Fork SUSPENSION FORK Electric-Assist Type Pedal assist or throttle Motor Specs BAFANG 500W 48V Mid Drive Drive System BAFANG 500W 48V Mid Drive Throttle Thumb Throttle on Handlebars Battery Type/Weight Lithium-ion 46.8V, 13.6Ah (636.4Wh) with LG Cells Charger Type 48V 3 Amp Fast Charger Max. Assisted Speed 28MPH on Pedal Assist, 20MPH on Throttle Handlebars ZOOM VLG-649 Aluminum 31.8 15 Degree Sweptback Bicycle Drivetrain Shimano RD-M310 8 Speed, Shimano 8 Speed SL-M310, SHF6X-ME-G5PS 170mm w/ 46 T Wheels 27.5 x 2.35 Tires Serfas e-Drifter 27.5 x 2.35 Brakes Tektro HD-T285 Hydraulic Disc Brakes w/ 180mm Rotors Color(s) Perrywinkle Blue | Hampton Grey Sizes 38cm, 44cm, 50cm Accessories & Extras Lights, Fenders, Rear Rack