Falken ZIEX ZE914 EcoRun is a summer tyre made in total of 117 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 215/55 R18 is 50mm wider than the narrowest dimension (165) and 0mm narrower than the widest one (215). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (215mm), which results in 118.25mm sidewall height. In 215/55 R18, there is only one possible speed index for Falken ZIEX ZE914 EcoRun - "H", which is good for speeds up to 210 km/h. In 215/55 R18, ZIEX ZE914 EcoRun usually competes against Ventus Prime3 K125, which is a tyre from Hankook with a rating of 52%, compared to 0% of the Falken in question.