255/40 R18 Nokian Powerproof variants

Weight index

Select: 9999

Speed index

Select: Select, Y (300 km/h)Y (300 km/h)

This combination is not available.

MFSNo

RunflatNo

Nokian Powerproof is a summer tyre made in total of 53 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/40 R18 is 50mm wider than the narrowest dimension (205) and 20mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height. In 255/40 R18, there is only one possible speed index for Nokian Powerproof - "Y", which is good for speeds up to 300 km/h. In 255/40 R18, Powerproof usually competes against Roadhawk, which is a tyre from Firestone with a rating of 59%, compared to 51% of the Nokian in question.