Sheldon Brown's | 
| Gear Calculator |
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by Sheldon "Gain Ratio" Brown
This article is also available in French 
You need to enter data for at least one chainring, and at least
one sprocket unless you choose a stock cassette.
Listing of hubs is A>Z by manufacturer, then by number of speeds, type and age.
Fichtel & Sachs, Sachs and SRAM are the same series of hubs, shown together.
This page covers all-derailer systems, and the more common internal-gear hubs.
Another page covers antique and rare internal-gear hubs as well.
The SRAM/Sachs 3 x 7, 3 x 8 and 3 x 9 and the Sturmey-Archer CS- RF3 and CS-RK3
are the only production internal-gear hubs designed to use rear sprocket clusters.
but other models are included in the list for the benefit of tinkerers -- see discussion.
Antique/rare internal gear hub? Click Here!
Too High-tech for you? You can use your slide rule instead!
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