Bürokraten, editor, Administratoren
15.340
Bearbeitungen
Nabenschaltungstheorie: Unterschied zwischen den Versionen
Nabenschaltungstheorie (Quelltext anzeigen)
Version vom 13. November 2019, 10:29 Uhr
, 13. November 2019→Rückhaltloser Aufbau: Sachs Elan und Rohloff Speedhub: Bilder...
(→Sturmey-Archer Achtgang: Bild) |
|||
| Zeile 139: | Zeile 139: | ||
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 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. | ||
Sachs Elan | <center> | ||
''Sachs Elan Zwölfgang-Nabe'' | |||
[[Datei:AelansmIMG 9057.JPG|center|Sachs Elan Nabe]] | |||
</center> | |||
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. | 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. | ||
<center> | |||
''Schnittmodell einer Rohloff 500/14 Speedhub'' | |||
[[Datei:Speedbild2small.jpg|center|Schnittmodell einer Rohloff 500/14 Speedhub]] | |||
</center> | |||
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. | 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. | ||
| Zeile 154: | Zeile 156: | ||
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. | 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== | == Shimano Elfgang== | ||