Dunlop Winter Sport 5 is a winter tyre made in total of 119 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 245/40 R18 is 50mm wider than the narrowest dimension (195) and 50mm narrower than the widest one (295). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height. In 245/40 R18, there is only one possible speed index for Dunlop Winter Sport 5 - "V", which is good for speeds up to 240 km/h. Latest test in 245/40 R18 was held by Sportscars in 2016, where Winter Sport 5 received rating "Exemplary" and finished on the 3. place. It was tested on a .