English roadsters use a 28 inch oversized tyre that is 635mm / 28 by 1 1/2...

Many higher volume 700c tyres come with a 28 inch marking but it is important to know they are not the same size as the rim is 622 mm.

Canadian roadsters use the 700c wheel and their fractional measurement is 28 by 1 3/8 by 1 5/8.

26 by 1 3/8 is the most common size on English made bikes and is also pretty much standard on many older 3 speeds including CCM bicycles.

It is important to know that this 26 inch size is not the same as a modern 26 inch mtb tyre and the tyre must have a fractional measurement.