Avon ZX7 is a summer tyre made in total of 41 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/55 R18 is 40mm wider than the narrowest dimension (215) and 40mm narrower than the widest one (295). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (255mm), which results in 140.25mm sidewall height. In
255/55 R18, ZX7 usually competes against
Tire Grabber GT Plus, which is a tyre from
General with a rating of 38%, compared to 25% of the
Avon in question.
