Avon ZV7 is a summer tyre made in total of 278 sizes, ranging from R13 to R13 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 195/50 R15 is 45mm wider than the narrowest dimension (150) and 80mm narrower than the widest one (275). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (195mm), which results in 97.5mm sidewall height. In 195/50 R15, there are 2 possible speed indexes for Avon ZV7 - "H","V", which are good for speeds up to 210, 240 km/h. In 195/50 R15, 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.