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@cafewanda
HI Kevans
I don't understand the gear ratio either! I run 46/20 on my SS, which I understand gives me 55.9 GI. I think that makes it very spinny but my knees can handle it. I'm on a 650c bike with 165mm cranks.
Try this site to get the info you need.
http://software.bareknucklebrigade.com/rabbit.applet.html
Hope it helps.