Continental PremiumContact 7 is a summer tyre made in total of 59 sizes, ranging from R16 to R16 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/35 R21 is 110mm wider than the narrowest dimension (205) and 0mm narrower than the widest one (315). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (315mm), which results in 110.25mm sidewall height. In 315/35 R21, there is only one possible speed index for Continental PremiumContact 7 - "Y", which is good for speeds up to 300 km/h. In 315/35 R21, PremiumContact 7 usually competes against Eagle F1 Asymmetric 6, which is a tyre from Goodyear with a rating of 93%, compared to 97% of the Continental in question.