Depending on the year, yes. For a while now, Cdale has offered complete bikes in even sizes, and framesets only in odd sizes. There are a few exceptions to this but for the most part, that is the way they have been doing things.
I think in '06 they offered the Six13 in a ton of colors and every size; very successful bike for them. Sometimes Cannondale will throw together a special bike or component package (in 07 there was a Six13 with 105, which I think was not in the catalog) that comes in odd sizes (53, 55, 57, 59)
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