we are offering internal geared hub. frame set - size 16" - aluminum steel - steeel front fork wheels - aluminum tires 26x1.95 24"x1.95 drivetrain - sun race inter-3 - sanyo dc-motorbrushless type24v 250w battery - sanyo lithium-ionen 24v11ah - charging time 4-5hr - cycle life 600 charger- input voltage ac100v-240v - input frequency 5060hz - input current 1.2a - output dc29.2v2.0a - operating condition 0-400c20-85%rh system features - traction control system - gear position assist adjust function - error message function brake - front with v-brake - rear with coaster brake drum brake hub disc brake assist mode - ecomidhigh sensor - torque sensor weight of bike - 30kgs (33kgs with batteries) weight of battery - 2.8kgs.