Sentury Qirin 990 255/50 R20

Sentury Qirin 990 is a summer tyre made in total of 113 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/50 R20 is 100mm wider than the narrowest dimension (155) and 20mm narrower than the widest one (275). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (255mm), which results in 127.5mm sidewall height.