Avon ZV7 is a summer tyre made in total of 279 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/60 R18 is 85mm wider than the narrowest dimension (150) and 40mm narrower than the widest one (275). This tyre profile of 60 means the sidewall height of the tyre is 60% of the tyre width (235mm), which results in 141mm sidewall height. In 235/60 R18, there is only one possible speed index for Avon ZV7 - "V", which is good for speeds up to 240 km/h. In 235/60 R18, ZV7 usually competes against N blue HD Plus, which is a tyre from Nexen with a rating of 0%, compared to 17% of the Avon in question.