Originally Posted by Camilo

It is not a 28mm wide tire (which is what you mean by 28C?). The 622 is a diameter measurement for the wheel itself, the ERTO nomenclature for a 700C wheel. The 35 denotes a 35mm tire width. So 35-622 = 700CX35, aka 700X35C. In either case the "C" refers to the classification of the wheel size, not the tire width.


1.35, in the 28X1.35, is the width of the tire in inches, equal to 35mm (which of course would actually be 1.38"... so I guess 1.4" would actually be closer since they want to round to the nearest .05")

The 28 denotes an approximate 28" diameter of the wheel and the mounted tire (in inches). It is the same 700C/622 wheel with a medium sized tire (in this case 1.35"/35mm)