plural of bottom gear

The lowest gearing available from a gearbox, typically in a motor vehicle or cycle.

The lowest gear available from a gearbox, typically in a motor vehicle or cycle. / One of the lower gears available from a gearbox, typically in a motor vehicle or cycle.

plural of low gear

The second gearing available from a gearbox. / (idiomatic, figuratively) Mediocre, sluggish performance.

(automotive) That part of a gearbox involved in changing gear, including the lever and the forks attached to it. / (automotive, US, Canada) The lever or other interface a human uses to shift gears.

plural of second gear

The ratio of the speeds of rotation of the initial and final gears in a gear train.

(Britain) The lever used to change gears in a motor car.

plural of gear ratio