Apparently the 55cm track frame has a 31.8" standover. The c'mute frame in 54cm is a 31.2" standover. I ride an ancient CCM with a 32" standover and it feels just a little tall for me, which is why I'm still sort of torn... I've heard conventional wisdom is to go with the smaller of two frame sizes.

The standover on the 52cm frame is 30.5... I don't know if I need almost 3" of clearance.

Thanks for the help.