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'''Hub gears''' or '''internal-gear hubs''' are a type of [[gear]] system used on [[bicycle]]s. ...fferent speed relative to the rear wheel's [[sprocket]] depending on which gear is selected.

[[Image:Shimano xt rear derailleur.jpg|right|thumb|Shimano XT rear derailleur on a mountain bike]] ...the chain from one sprocket to another. Although widely referred to as "[[gear]]s", bicycle "gears" should properly be referred to as '''sprockets''' sinc

...ear]].]][[Image:Shimano xt rear derailleur.jpg|right|thumb|Shimano XT rear derailleur on a mountain bike]] [[Image:Bevelgear.jpg|thumb|[[Bevel gear|Bevel ring gear]] on the rear wheel of a [[shaft-driven bicycle]]]]

In [[mechanics]], a '''transmission''' or '''gearbox''' is the [[gear]] and/or [[hydraulic]] system that transmits mechanical [[power (physics)|p ...the output speed of the engine and increase torque. However, the highest gear(s) may be an "[[overdrive (mechanics)|overdrive]]" type that increases the

...mechanism for bicycle wheels, derailleurs, and the patented "rod" gear for gear changing. [[Gino Bartali]] made a strong impression as he won mountainous ...duced a complete [[compact drivetrain]] system, to enable the use of lower gear ratios compared with the standard racing versions. Campagnolo is currently

...ain biking that is done using a [[single-speed bicycle]] that has only one gear (approx. 2:1 ratio) and generally fewer components. The idea is simplicity. ...nd downhill bikes is the possible use of dual front chainrings and a front derailleur, while downhill bikes almost always have a single front ring.

...ontrol. This refinement led to the 1898 invention of ''coaster brakes''. [[Derailleur gears]] and hand-operated, [[Bicycle brake systems|cable-pull brakes]] were ...to maintain an optimum pedaling speed while covering varied terrain. The gear systems are usually hand-operated, via cables (or rarely, hydraulics), and

Bicycles continued to evolve to suit the varied needs of riders. The [[derailleur]] developed in France between 1900 and 1910 among cyclotourists, and was im .... Lighter cycles, with hand brakes, thinner tires, and a three-speed [[hub gear]]ing system, often imported from England, first became popular in the Unite

...bsp;km climb. When others attacked, he stayed in the saddle but changed up gear, to a sprocket three teeth smaller.