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17",18" & 22"
18" tyres normally fit rims with 355mm diameter - they will have an ERTRO number similar 37-355 ( 37mm wide x 355 rim diameter).
18 x 3/8 tyres have different diameters and are marked so.
22" tyres normally have a rim diameter of 489mm e.g. 22 x 2.0 (50-489)
There are some odd sized tyres called 22" with a different diameter - and they are marked so eg (37-490).