Originally Posted by
koolerb
I was reading again today, that always trouble. For my 34" inseam I'm reading that I should be riding 172.5 or 175mm crankset on my 23" frame. My BB is about 25.5 cm from the floor, and current 170mm crank arm is about 9.3mm from the floor at vertical.
First, as others have said, just ride and enjoy.
Second, your numbers don't add up. 25.5 cm - 170 mm = 8.5 cm. If your crank has a radius about they center of the eye of 7.8 cm or so, you can come up with the 9.3 mm from the floor to the crank. I'm guessing the actual radius is about 6 cm less than that.