gearhead

listen to the pronunciation of gearhead
English - English
A mechanical device used to increase the torque of gears

HLD has developed a linear belt actuator that circulates the belt in an unusual way, resulting in a gearing reduction of up to 40:1 without a gearhead.

An enthusiast for new technology, or for motoring

A self-proclaimed gearhead, Leno loves fast Fords and hot Harley-Davidson motorcycles.

{i} cyclist who spends more time adjusting his gears than enjoying the ride or the scenery (British Slang)