Avon ZV7 is a summer tyre made in total of 313 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/45 R18 is 105mm wider than the narrowest dimension (150) and 20mm narrower than the widest one (275). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (255mm), which results in 114.75mm sidewall height. In
255/45 R18, ZV7 usually competes against
Protech NewGen, which is a tyre from
Viking with a rating of 40%, compared to 31% of the
Avon in question.