Joined: Jul 2006
Posts: 9,158
Likes: 1,743
From: Lebanon (Liberty Hill), CT
Bikes: Canyon Aeroad, CAAD 12, MASI Gran Criterium S, Colnago World Cup CX, Guru steel & Guru Photon
I've never understood the seat tube measurement from center of BB. I measure from center of pedal spindle. Not all crank arms are equal length although, obviously, you may know if yours are.