back gear

This had a back gear to give an increased range of speeds, and a sliding saddle to move the tool along the work.

Four front and one back gear.

Larger lathes sometimes had two-speed back gears which could be shifted to provide a still lower set of speeds.

These gears were called back gears.

Still, none of that comes close to holding back Gears of War 2 from its destiny: being one of the best games available on the Xbox 360."

Various types of speed-changing mechanism achieve this, from a cone pulley or step pulley, to a cone pulley with back gear (which is essentially a low range, similar in net effect to the two-speed rear of a truck), to an entire gear train similar to that of a manual-shift auto transmission.