Firestone Fs400 245/70 R19

Firestone Fs400 is a tyre made in total of 8 sizes, ranging from R17 to R17 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 245/70 R19 is 235mm wider than the narrowest dimension (10) and -233mm narrower than the widest one (12). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (245mm), which results in 171.5mm sidewall height.