Kumho Ecsta PS31 255/35 R18

Kumho Ecsta PS31 is a summer tyre made in total of 59 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/35 R18 is 70mm wider than the narrowest dimension (185) and 20mm narrower than the widest one (275). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (255mm), which results in 89.25mm sidewall height.