Pirelli P ZERO is a summer tyre made in total of 309 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/45 R18 is 20mm wider than the narrowest dimension (205) and 110mm narrower than the widest one (335). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (225mm), which results in 101.25mm sidewall height. In 225/45 R18, there is only one possible speed index for Pirelli P ZERO - "W", which is good for speeds up to 270 km/h. Latest test in 225/45 R18 was held by AutoMotorSport in 2020, where P ZERO received rating "Very good" and finished on the 4. place. It was tested on a BMW 3 series.
