Yokohama BluEarth ES-32 is a summer tyre made in total of 69 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 50mm wider than the narrowest dimension (175) and 10mm narrower than the widest one (235). 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 Yokohama BluEarth ES-32 - "W", which is good for speeds up to 270 km/h. In 225/40 R18, BluEarth ES-32 usually competes against Sportnex AS-2+, which is a tyre from Nankang with a rating of 20%, compared to 0% of the Yokohama in question.