Quote Originally Posted by arielmoon View Post
UPDATE: I called and talked to one of the other mechanics and he claims that 2.5mm is not going that much of a difference on the crank. He was not open to the idea to say the least.

He says the shop has shoe shims that we can try but he really wants me to come in and get re fitted. He is the head mechanic and is a very strong, experienced rider.

I am going to try to do that this week but I am also considering this guy I heard about that does a bike studio fit. Not cheap but really helped a rider I know of.
Quote Originally Posted by arielmoon View Post
It says 172.5.

I am 5'7. 31" inseam. Plugged into that formula puts me at 169.88.

Very interesting info! Thanks for the link!
I'm 5'7" with about 31.5" inseam. My bike came with 175mm crankarms for some unknown reason. Once they changed them to 172.5mm, it was heavenly. I really noticed those millimeters! That said, with your stats, I wouldn't go shorter than 170mm. Eventually, you're going to start losing noticeable torque.