Toyo Celsius is a allround tyre made in total of 56 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 245/45 R18 is 90mm wider than the narrowest dimension (155) and -50mm narrower than the widest one (195). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (245mm), which results in 110.25mm sidewall height. In 245/45 R18, there is only one possible speed index for Toyo Celsius - "V", which is good for speeds up to 240 km/h. In 245/45 R18, Celsius usually competes against AllSeasonContact, which is a tyre from Continental with a rating of %, compared to 0% of the Toyo in question.