gearhead

noun2

1. •
   (informal) An enthusiast for new technology, or for motoring.

   • A self-proclaimed gearhead, Leno loves fast Fords and hot Harley-Davidson motorcycles. — 2000
2. •
   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. — 2007

noun1

1. •
   A fan of the Gears of War media franchise centered on a series of video games.

   • For all you Gear-heads out there, Microsoft is going to release four new maps for “Gears of War” on the Xbox Live marketplace today. — 2007