Toyo Proxes T1R 305/30 R20

Toyo Proxes T1R is a summer tyre made in total of 30 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 305/30 R20 is 80mm wider than the narrowest dimension (225) and -10mm narrower than the widest one (295). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (305mm), which results in 91.5mm sidewall height.