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I'll dig out the code and post it tomorrow. Apologies in advance to anyone who tries to read it...
Either way it suggested that you could get up a 20% gradient with a 50/12 or something which I found a little hard to believe. I made it because I was wondering about the maximum gradient you could get up on a fixie/SS, given that the maximum torque you can apply is based on your body weight, and whether you could base your gear choice off that. There are a bunch of factors I didn't account for in my "model" though and I wonder whether anyone can devise anything better.
Do share.