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You need to enter data for at least one chainring, and at least
one sprocket unless you choose a stock cassette.
Listing of internal 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 most internal hubs back to the original 1902 Sturmey-Archer
Many of the hubs listed, and some of the cassettes, are no longer in production.
Another page omits antique and rare internal-gear hubs.
Clicking on "calculate" generates two new output pages: a full-size one, and a small one which you might print out and tape to your bicycle's handlebar stem for reference. The small one will overlay the large one in a browser which supports tabs.
If you do a calculation, then bring those to the front, subsequent "results" windows from subsequent calculations may be hidden behind them.
For multiple calculations, you should close each set of results in turn, not hide them.
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;
The Sturmey-Archer-Brompton BWR takes two sprockets,
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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