Imperial All Season Driver is a allround tyre made in total of 134 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 235/45 R20 is 90mm wider than the narrowest dimension (145) and -20mm narrower than the widest one (215). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (235mm), which results in 105.75mm sidewall height. In 235/45 R20, there is only one possible speed index for Imperial All Season Driver - "W", which is good for speeds up to 270 km/h.
Relevant tyre tests in same or similiar dimension (235/45 R20)
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