crank length

[KnottedYet]

I don't know nothin'.

There are some pretty wild equations you can use to figure out crank length. Don't know where they went, but if I find 'em I'll post 'em.

Honestly, that's too much math for me.

I have 170's on one bike and 175's on the other. I like my 175 a lot. I'm a masher with long femurs.

I guess you just start with what you've got, list out any problems you have with them (do they hurt your knees, can you get a good KOPS, do you feel like you are struggling against them, and so on) and then change out from there.

Before going after crank length, though, I'd get a really good bike fit. Make sure it isn't an issue of saddle placement or reach or cleats affecting your leggies.