The first number in the 215/50 R17 description represents width, which is expressed in millimetres, and measured as the greatest distance from sidewall to sidewall, with the tyre mounted onto the rim. The second number refers to cross section height, and represents a percentual value. In the case of the 215/50 R17 size class, 50% of 215 mm gives us a flank height of 107.5 mm. The description also offers indications regarding the size of matching rims - 17 inches, in our case, which is the same size as the tyre’s inner diameter.
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