Recently, on our local bay area cx email list, someone asked about whether folks like the same or smaller sized cx bike compared to their road bike. He didn't specify what he meant by size, so the question and answers were not very specific, since TT lengths vary by brand even for the same size. So you might ride 58s in both but that doesn't mean much to me unless I know the TT length.
But it brings up the age-old question whether you should go slightly shorter on the TT and/or stem. If I remember correctly, in Simon Burney's Cyclocross: Training and Technique
, he recommends you should go 1cm shorter in both the stem and TT.
I've played around on many different cx bikes and have been going shorter over the years. That might because I'm getting old and stiff. But I'm curious to hear your experiences.
Molly Cameron has an interesting short post
looking at a few photos of rider's positions, alluding to the fact that top riders don't usually have road-like positions.
What do you think?