Nabenschaltungstheorie: Unterschied zwischen den Versionen

The Sachs Elan, no longer available, was the first internal-gear hub which tried to rival modern derailer gearing. It has its own page on this site.

The currently-available Rohloff Speedhub has 14 speeds, with even steps of 13% each and an overall range of more than 5 to 1. The Rohloff is marketed as a replacement for a wide-range derailer system, competitive in terms of weight and efficiency, and superior in reliability.

This hub has three planetary stages, from left to right in the illustration above. The first and second stages have two-step compound gearing with identical tooth counts. The first stage only gears down and the second stage, up. Seven of the nine possible gearing combinations are used; the two unused combinations would provide unity ratios but would transmit power through both sets of gears.

The Rohloff Speedhub is the most versatile, and by far, the most expensive internal hub available as of this writing. It revives desirable features of the classic internal-gear hubs – oil lubrication, weight-optimized construction – but it prices itself out of the urban-cycling market. Rohloff engineering of a hub with 7 somewhat more widely-spaced speeds would be an interesting prospect.

== Shimano Elfgang==