Michelin Pilot Sport 4S 325/25 R21 is a summer tyre dedicated to sports and high-powered cars. Chosen by major brands such as Ferrari and Porsche as standard equipment for their models, it boasts a series of top-level technical features.
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325/25 R21 tyres
You can choose from these 325/25 R21 tyre brands: Continental, Hankook, Michelin, Pirelli, Yokohama.
325 (Width in millimeters)
325 is the tyre width expressed in millimeters and measured (from the widest point of its outer sidewall to the widest point of its inner sidewall) from shoulder to shoulder. Before buying the tyre it is essential to check that your cars supports the tyres listed on this page, which are 325 wide.
25 (Shoulder, height or profile in percent)
25 is the second value reported in the tyre, and represents the aspect ratio or series of the tyre, that is the height of the sidewall of the tyre. It is not expressed in millimeters but as a percentage of the width of the tyre. For example, for tyres with a width of 325 and shoulder 25, the measurement is 81 millimeters (325 x 25 / 100).
21 (Rim diameter in inches)
21 is the diameter (expressed in inches) of the rim on which the tyres can be mounted. All tyres listed on this page are specific for 21-inch wheels. In rare cases, this value is expressed in millimeters.
