Westlake Z-507 225/50 R18

Westlake Z-507 is a winter tyre made in total of 65 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/50 R18 is 30mm wider than the narrowest dimension (195) and 50mm narrower than the widest one (275). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (225mm), which results in 112.5mm sidewall height.