Pirelli Scorpion Rally STR 180/55 R17

Pirelli Scorpion Rally STR is a winter tyre made in total of 10 sizes, ranging from R13 to R13 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 180/55 R17 is 50mm wider than the narrowest dimension (130) and -90mm narrower than the widest one (90). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (180mm), which results in 99mm sidewall height.