Sumitomo Wt200 is a tyre made in total of 39 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/40 R18 is 70mm wider than the narrowest dimension (155) and 0mm narrower than the widest one (225). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (225mm), which results in 90mm sidewall height. In 225/40 R18, there is only one possible speed index for Sumitomo Wt200 - "V", which is good for speeds up to 240 km/h. In 225/40 R18, Wt200 usually competes against , which is a tyre from with a rating of %, compared to 0% of the Sumitomo in question.