I was rereading this article about bike fitting.

http://www.peterwhitecycles.com/fitting.htm

Under the Crank Length section, he talks about using a formula, which involves taking 18.5% of a measured length.

According to that measurement, I'm suppose to be using 162-163mm cranks. Is this right? At 5' 7" with a 30" pant inseam (32" cycling inseam), I think I've got pretty normal proportions.

My current cranks are 172.5mm.