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.
If you do a calculation, get a result, then bring this window to the front, subsequent "results" windows from subsequent calculations may be hidden behind this window.
For multiple calculations, you should close each "results" window in turn, not hide them.
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