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285/45 R21 Riken Road Performance variants
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Riken Road Performance is a tyre made in total of 56 sizes, ranging from R15 to R15 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 285/45 R21 is 120mm wider than the narrowest dimension (165) and -60mm narrower than the widest one (225). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (285mm), which results in 128.25mm sidewall height. In 285/45 R21, Road Performance usually competes against , which is a tyre from with a rating of %, compared to 0% of the Riken in question.
Riken Road Performance is made in 56 sizes, starting from 165/60 R15 up to 225/60 R16.