Avon ZX7 is a summer tyre made in total of 41 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/45 R20 is 40mm wider than the narrowest dimension (215) and 40mm narrower than the widest one (295). 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 R20, 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.
