Sheldon Brown's | 
| Gear Calculator |
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The SRAM/Sachs 3 x 7 and 3 x 8
are the only production internal-gear hubs
designed to use
more than one rear sprocket, but other models are included in the list for the benefit of tinkerers.
Gain Ratios |
Gear Inches |
Meters Development |
About Percentages |
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