Some useful approximations for tyre sizing.

Remember that Radial tyres are on the whole 80% the diameter of the cross ply, so very often a tyre that is the equivalent could be smallon diameter, but to get the diameter then it's a "fatter" tyre. We can always try and advise if you are stuck as to which Blockley radial tyre size you require! For example cars maufacturers that specified 6.40x15 in period would give differing radial options of 165R15 and 185R15. . . . But all teh same the list below should prove helpful.