Dunlop SP MAX Roadsmart II 200/50 R18

Dunlop SP MAX Roadsmart II is a winter tyre made in total of 8 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 50mm wider than the narrowest dimension (150) and 0mm narrower than the widest one (200). 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.