315/40 R21 Dunlop SP Sport MAXX RT2 variants

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Dunlop SP Sport MAXX RT2 is a summer tyre made in total of 101 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/40 R21 is 110mm wider than the narrowest dimension (205) and -30mm narrower than the widest one (285). 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, SP Sport MAXX RT2 usually competes against Eagle F1 Supersport, which is a tyre from GoodYear with a rating of 71%, compared to 72% of the Dunlop in question.