A gear shift is the control that changes which gear you are in. Work the gear shift.
It must be used while pedalling, since the chain has to be moving to climb across. A gear shift under full load will grind and eventually snap a chain.
1noungear shiftThe control that changes which gear you are in.
“The gear shift was on the down tube, which dates the bike exactly.”
gear shift is a control.
Practised in Cycling