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@frankenbike
Maths puzzle that I pondered the other day - assuming that you don't pull up on the bars, what's the maximum gradient that you can ride up (without pushing off the ground into a rolling start) in a given gear ratio?
Hint: your full body weight at 1 crank length from the BB is the maximum torque you can put through the system.
I made a little Python calculator and the results were a bit surprising.