315/40 R21 Continental UltraContact variants

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Continental UltraContact is a summer tyre made in total of 80 sizes, ranging from R14 to R14 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/40 R21 is 160mm wider than the narrowest dimension (155) and -120mm narrower than the widest one (195). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (315mm), which results in 126mm sidewall height. In 315/40 R21, UltraContact usually competes against N blue HD Plus, which is a tyre from Nexen with a rating of 42%, compared to 0% of the Continental in question.