Companheiro
dafisomo
Inch/Imperial sizes
Inch size designations are less accurate. A tire marked
28 x 1 5/8 x 1 3/8 indicates an approximate outer diameter
of 28 inch, the tire section height of 1 5/8-inch, and the
tire section width of 1 3/8-inch.
Inch sizes can also follow
the pattern 26 x 2.10, which, in this case indicates only
tire’s outer diameter and the tire’s section width.
Inch sizes are ambiguous and lack accuracy. For example,
the diameters 559 mm (MTB), 571 mm (Triathlon)
and 590 mm (Touring) are all designated 26 inch. Tires
with diameters 622 mm and 635 mm are both designated
28-inch, yet, surprisingly, tires with a diameter of 630
mm are designated 27-inch.
Segue este link:
http://www.schwalbe.co.uk/pdf/techinfo.pdf
Vais encontrar um PDF com a informação que necessitas. Na página 5 consegues encontrar uma tabela comparativa das dimensões dos pneus.
Um abraço
NY