้how your bike moves
Gears really get things. most gears are wheels with teeth. look at the bicycle at the bottom of the page. a bicycle has two gears. one is joined to the pedals a pedal gear. the other is in the center of the back wheel a rear gear. a chain links,or engage,these two gears. as you move the pedals,the chain moves too. the chain fits into the toothed gears and turns the back wheel.