Originally Posted by TommyL

Okay, I understand now. But I'm pretty sure my bike's top tube i sparallel to the ground. I certainly can't see a slope either way. The only thing I can think of is that they measure to the top of the seat tube. I could've sworn that the specs said center to center. Does anybody know where I can find the geometry for this bike? They take them off of the Trek's website each year.