GoodYear UltraGrip Performance 3 305/30 R21

GoodYear UltraGrip Performance 3 is a winter tyre made in total of 356 sizes, ranging from R14 to R14 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 305/30 R21 is 130mm wider than the narrowest dimension (175) and -20mm narrower than the widest one (285). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (305mm), which results in 91.5mm sidewall height.