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. 225/40 R18 is 70mm wider than the narrowest dimension (155) and -30mm narrower than the widest one (195). 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 Toyo Celsius - "V", which is good for speeds up to 240 km/h. In 225/40 R18, Celsius usually competes against AllSeasonContact, which is a tyre from Continental with a rating of 83%, compared to 0% of the Toyo in question.