Hankook ION Evo is a summer tyre made in total of 66 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 305/30 R21 is 90mm wider than the narrowest dimension (215) 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. In
305/30 R21, ION Evo usually competes against
Pilot Sport 4 S, which is a tyre from
Michelin with a rating of 96%, compared to 96% of the
Hankook in question.