Firestone Firehawk SZ90 245/45 R17

Firestone Firehawk SZ90 is a summer tyre made in total of 41 sizes, ranging from R13 to R13 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 245/45 R17 is 50mm wider than the narrowest dimension (195) and 10mm narrower than the widest one (255). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (245mm), which results in 110.25mm sidewall height.