It arrives fully assembled and ready to go! Four castor wheels with independent suspension keep the Salsa M2 stable and a 7cm kerb climbing ability and top speed of 6mph. Features:- Compact mid wheel drive base- 6 wheel independent suspension- 7cm kerb climbing ability- 13" drive wheels Seat Width: 45.7cmSeat Depth: 50.8cmBackrest Recline-4° to 16° (Standard)Armrest Height: 24.5Speed: 6MPHBattery Size: 80AhMax.