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. 275/40 R20 is 130mm wider than the narrowest dimension (145) and -60mm narrower than the widest one (215). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (275mm), which results in 110mm sidewall height. In 275/40 R20, there is only one possible speed index for Imperial All Season Driver - "Y", which is good for speeds up to 300 km/h.
275/40 R20 is found on 8 vehicles: