New Member
Nov 9, 2001
There was a question about 28 inch tyres, a week or two ago. Now I can't find it, tsk, tsk. I did find some info. posted to another list sometime ago, and which I did write down, so here goes:<br /><br /> There are at least four or five different sizes in the 28 inch family of tyres.<br /><br /> 700 647 28 x 1 1/4&quot; Very Rare. <br /> 700 A 642 28 x 1 3/8 &quot; Very common, on old bikes.<br /> 700 B 635 28 x 1 1/2 &quot; Not so common.<br /> 700 C 622 28 x 1 3/4 &quot; Widespread, 'modern' size.<br /><br />Note that the now obsolete 27 x 1 1/4 size has a Bead Seat Diameter of 630 m/m , but it is not included in the 28 inch family. It was an odd size created by<br />Dunlop. Confused? So was I. Ciao.
I should add a word of caution. American (U.S.A.) sizes are of little relevance to us in Australia, as far as I know. For example, the U.S. size of 26 x 1 3/8 will not fit a British rim of 26 x 1 3/8&quot; because the Bead Seat Diameter of the U.S. tyre is 584 m/m, whereas the other is 590 m/m. The former is often referred to as a 'Schwinn' size, yet another example of manufacturers creating their own sizes.<br /><br />The most suitable tyre chart for us down under is listed somewhere...under<br />'Dagworth and Gentleman's Cycling Club', or something like that...I've lost the url... it also gives some explanation. If you should find it, please let me know.<br /><br />Best Wishes for Christmas and The New Year to All.