Originally Posted by smurfy
From what I have heard with an S-A hub you don't want to go lower than a 41" low gear because it can destroy the hub.
I have never heard that... and we have done everything in our power to destroy one of them. The only sure method I have found is run them with out oil while abusing them.
Also jonwvara go to
Bikesmith Design the last I knew he was working on a 28t cog/conversion for SA hubs

FWIW that is
MnHPVA Guy here on the boards and he probably knows more about the limits and capabilities of the SA hub than anybody I know.
Aaron