crank length for new bike

[KnottedYet]

There are formulas for determining crank length. Some involve the length of your whole leg, some involve just the length of your thigh. I think some involve a third order tensor describing space-time in the general vicinity of your leg.

Go with what feels right.

I think I like the "3rd order tensor function describing space-time" better than the old "18.5% of your length from greater trochanter to bottom of heel."

Much more exciting! (but does it give you a length in parsecs? and will it cause distruptions in the spacetime continuum?)