Dunlop SP Sport 01 275/45 R18

Dunlop SP Sport 01 is a summer tyre made in total of 67 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 275/45 R18 is 90mm wider than the narrowest dimension (185) and -10mm narrower than the widest one (265). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (275mm), which results in 123.75mm sidewall height.