Yokohama Advan Sport V105 is a summer tyre made in total of 123 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/50 R20 is 60mm wider than the narrowest dimension (195) and 50mm narrower than the widest one (305). 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. In 255/50 R20, there is only one possible speed index for Yokohama Advan Sport V105 - "Y", which is good for speeds up to 300 km/h. In 255/50 R20, Advan Sport V105 usually competes against Azenis FK510, which is a tyre from Falken with a rating of %, compared to 0% of the Yokohama in question.