basic components common to most bikes include a seat, pedals, gearing, handlebar, wheels, and brakes, all mounted on a frame. the majority also have a gear shifter. the cyclist's feet push the pedals to make them go around in circles, which moves the chain, which turns the back wheel of the bike to make the bike move forwards. the front wheel is connected to the handlebar, so turning the handlebar from side to side swivels the front wheel which steers the bike.