Joined: Jul 2002
Posts: 40,863
Likes: 3,116
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
Personally, if I'm between, I'll go down a size. A lot of that has to do with my stumpy legs and need for top tube clearance, but that may not matter if you're talking about a sloping TT frame.