gear·shift 
/ˈgiɚˌʃɪft/ noun
plural gear·shifts /ˈgiɚˌʃɪft/ noun [count] US : a lever or other device that is moved to change gears in a car, on a bicycle, etc. —called also (Brit) gear lever (Brit) gearstick (US) shifter; — see pictures at bicycle, car; compare stick shift
