Goodyear Wrangler Duratrac is a summer tyre made in total of 6 sizes, ranging from R17 to R17 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. This tyre profile of 60 means the sidewall height of the tyre is 60% of the tyre width (255mm), which results in 153mm sidewall height. In 255/60 R20, there is only one possible speed index for Goodyear Wrangler Duratrac - "Q", which is good for speeds up to 160 km/h.