Originally Posted by rodscot

Many thanks, I had tried reading that yesterday but found it so riveting that my attention became distracted by a spider climbing the wall. However, I have now read it more slowly and kind of understand it better now. It does make me wonder now if I am wise to try to fit a 700 x 28 tyre where I currently have 700 x 35 fitted. Or maybe the difference in width is not that great to matter.