I tried like hell for the 4.5" BS but it's a tough size to find. I got ID sizes of the new wheels vs. what I got and i think I'll clear them by 1/8" or so. I'm more worried about the tire height than anything. Although the 9" wheel might stop it from bulging a lot. If the 28's don't fit I can always use a 26" tire. I'm not familiar with the shop you are talking about though.