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Shimano Nexus
Shimano Nexus is a brand of bicycle components which includes products such as epicyclical gear hubs, cranksets, shifters, brake levers, hub brakes, hub dynamos, and a CPU for automatically changing gears. The series is primarily aimed at the "comfort" market such as urban commuters and tourers, and as such is not made to withstand the rigours of off-road or mountain biking. The free-wheeling Nexus internal gear hubs are compatible with Shimano's "roller brake", its version of a drum brake,〔(Shimano tech doc for Nexus Inter 3 with "roller brake" installation instructions )〕〔(Shimano product spec page for Nexus Inter 7 indicating "roller brake" compatible )〕〔(Shimano product spec page for Nexus Inter 8 indicating "roller brake" compatible )〕 but not with the Shimano disc brakes used with the higher-end Shimano Alfine internal gear hubs.
==History==
In 1995, Shimano rolled out its Nexus line of seven- and four-speed internal hubs. These had a new rotary actuator that did away with externally protruding gear shifting elements in the rear wheel. Also, the gear units were able to be shifted under moderate pedaling loads. Shimano had manufactured three speed hubs prior to that, and these hubs were at that point re-branded Nexus. In the early 2000s the 8-speed Nexus hub gear was introduced, having two stepped planetary series mounted downstream of each other. The hub was operated with a twist shifter. By November 2006, The Nexus range came in several ranges (Inter 3, Inter 7 and Inter 8) providing 3, 7 and 8 speed models respectively.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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