Avon ZV7 is a summer tyre made in total of 58 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/40 R18 is 40mm wider than the narrowest dimension (185) and 30mm narrower than the widest one (255). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (225mm), which results in 90mm sidewall height. In 225/40 R18, there are 2 possible speed indexes for Avon ZV7 - "W","Y", which are good for speeds up to 270, 300 km/h. Latest test in 225/40 R18 was held by Tyre Reviews in 2021, where ZV7 received rating "" and finished on the 10. place. It was tested on a .