Yokohama Geolandar G91AV is a winter tyre made in total of 3 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/55 R18 is 10mm wider than the narrowest dimension (225) and 0mm narrower than the widest one (235). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (235mm), which results in 129.25mm sidewall height. In 235/55 R18, there is only one possible speed index for Yokohama Geolandar G91AV - "H", which is good for speeds up to 210 km/h. In 235/55 R18, Geolandar G91AV usually competes against Vector 4Seasons SUV Gen-2, which is a tyre from Goodyear with a rating of 0%, compared to 0% of the Yokohama in question.