Older than dirt
Join Date: May 2008
Location: Winchester, VA
Bikes: Too darn many.. latest count is 11
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Also depends if you plan to agressively ride it. I prefer to be stretched out on my road bike, and ride a 55cm Lemond, which is pretty equivalent to 56 in most other brands. In my Cross bike (Fuji Cross Pro) I went to 54cm with it. The bike just felt "right" when riding it and I've had no fit related issues in well over 1k miles. When you test ride, you need to at least get in some grass or loose gravel to get a feel, it's certainly not the same handling as a road bike in that respect. You need it to be pretty quick and nimble without being twitchy. Top tube clearance you'll also want a bit more than most road bikes need.
I soooo wanted a Specialized Tricross, but 54 was too small, and due to the arch in the top tube on them, 56 didn't have enough standover.