Dunlop SP MAX Roadsmart II 200/50 R18

Dunlop SP MAX Roadsmart II is a winter tyre made in total of 13 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 200/50 R18 is 90mm wider than the narrowest dimension (110) and -80mm narrower than the widest one (120). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (200mm), which results in 100mm sidewall height.