Here's a fit chart for the speed concept http://www.slowtwitch.com/...C_FitGuide_final.pdf
The lowest size M goes in Low-Near configuration will be 590. If you think your wife will need something lower. Get the S. Otherwise, get the M. The drat box matches the frame very well on M (which looks nicer). I consider the wheelbase on a size S on the short side if you are going to use all the reach, especially going downhill in aero. I think Trek should've slackened the headtube on size S a tad to increase its front center.
The lowest size M goes in Low-Near configuration will be 590. If you think your wife will need something lower. Get the S. Otherwise, get the M. The drat box matches the frame very well on M (which looks nicer). I consider the wheelbase on a size S on the short side if you are going to use all the reach, especially going downhill in aero. I think Trek should've slackened the headtube on size S a tad to increase its front center.
Last edited by:
bloodyshogun: Nov 9, 17 13:56