Avon WV7 is a winter tyre made in total of 0 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 245/40 R18 is 245mm wider than the narrowest dimension () and -245mm narrower than the widest one (). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height. In 245/40 R18, WV7 usually competes against , which is a tyre from with a rating of %, compared to 46% of the Avon in question.