Yokohama BluEarth-4S AW21 is a allround tyre made in total of 100 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/40 R18 is 60mm wider than the narrowest dimension (175) and 30mm narrower than the widest one (265). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (235mm), which results in 94mm sidewall height. In
235/40 R18, BluEarth-4S AW21 usually competes against
Weather Control A005 EVO, which is a tyre from
Bridgestone with a rating of 0%, compared to 40% of the
Yokohama in question.