23 Skidoo's been through one so I would head what he has to say. I looked over his and it does look very similar. I think the headbadge is going to tell you what you are looking at. The other clues will be the wieght and seat post size. If I am remembering correctly they have a shim to allow the seat tube ( about 27.2) to be shimed down to a 1 in.