Bridgestone Dueler H/P Sport 305/40 R20

Bridgestone Dueler H/P Sport is a summer tyre made in total of 153 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 305/40 R20 is 100mm wider than the narrowest dimension (205) and 10mm narrower than the widest one (315). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (305mm), which results in 122mm sidewall height.