Join Date: Aug 2005
Location: Columbus, Ohio (Grandview area)
Bikes: 2009 Felt X City D, 1985 (?) Trek 400, 1995 (?) Specialized Rockhopper, 1995 Trek 850
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Historically, CX bikes have had higher standover heights because of higher bottom bracket heights. I'm not sure how universal this is today. Actually, nothing is universal it seems, and bike geometries seem to vary all over the place. Lots of CX bikes do seem to size larger than stated, though.
I ride a 2010 Kona Jake in 54 cm, and a 2011 BMC Streetracer in 57 cm. They both fit me pretty well, though I'm considering a slightly longer stem for the Kona. The BMC has a slightly more relaxed geometry than a true racing bike, with a slightly taller headtube, which probably makes it a bit more comfortable than some. For me, at least. I was considering a Felt Z series until the BMC went on clearance last fall. Or maybe a Cannondale Synapse.
I'm not sure I helped much, but it really isn't uncommon to ride a size or two smaller CX bike than road bike. They're all different, though.