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. 225/55 R18 is 60mm wider than the narrowest dimension (165) and -10mm narrower than the widest one (215). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (225mm), which results in 123.75mm sidewall height. In 225/55 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 225/55 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.