Pirelli P ZERO is a summer tyre made in total of 307 sizes, ranging from R17 to R17 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 355/30 R19 is 150mm wider than the narrowest dimension (205) and -20mm narrower than the widest one (335). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (355mm), which results in 106.5mm sidewall height. In 355/30 R19, there is only one possible speed index for Pirelli P ZERO - "Y", which is good for speeds up to 300 km/h.