The weight of the rider has no direct relationship with the force they are putting through the crank, because they are never standing statically on it.MrMagura wrote: ↑Sun May 19, 2019 4:26 pmYou have to do a bit of pocket math here
Assume a rider that weighs 100kg, a 175mm crank arm, and for the ease of it, say a 39T chain ring of say 175mm diameter.
Pins of the chain are approx 3mm in diameter, and let's be boring and say the load bearing part of the pins is 3mm wide.
100kg is approx. 1kN, which is doubled by the lever as the chain is being pulled at approx. half way out the crank arm, so 2kN.
A quick bit of work tells me that a rider (of any weight) doing 500W at 90RPM is putting an average of 33kg through the whole pedal stroke.