This is great news everyone! Thanks for the replies! I have been commuting for a year now and am looking forward to experience a rack and bag/panniers. The reason for my cautiousness is that most commuters I know use 700X28 at the very least. I rarely run into rear rack/bag commuters on 23s. But this is great to know! Thanks again! I hope the Topeak combo is as good as people on here say it is!