I've got a (rod brake, single speed) roadster bike with 28 inch wheels. I wanted to put a 3 speed coaster hub on it, so yesterday I bought a replacement rear wheel. Unfortunately it's not the size I thought I was getting, as 28 inches can apparently mean either 635mm or 622mm. So now I'm wondering: should I set up my bike with the 622 wheel? Is it a problem having a 635 in front and a 622 in back? Also, would the bike ride worse with the smaller 622?