The few times I've sold a bike on Craig's List, I've purposefully not put the size. I figured, after seeing all the "26 inch bike" posts and the lack of sizing info that my target market would get confused...so I put the size of the person the the bike would fit. If I was going to list an expensive bike, then I would put the sizes in.
I know when I first started, the differences between mountain/comfort/roadbike sizing was really confusing to me.
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