Avon ZX7 255/65 R17

Avon ZX7 is a summer tyre made in total of 67 sizes, ranging from R13 to R13 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 255/65 R17 is 40mm wider than the narrowest dimension (215) and 40mm narrower than the widest one (295). This tyre profile of 65 means the sidewall height of the tyre is 65% of the tyre width (255mm), which results in 165.75mm sidewall height.