Bridgestone Battlax S21 190/55 R17

Bridgestone Battlax S21 is a summer tyre made in total of 10 sizes, ranging from R17 to R17 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 190/55 R17 is 40mm wider than the narrowest dimension (150) and 10mm narrower than the widest one (200). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (190mm), which results in 104.5mm sidewall height.