The 225/50 R17 tyre description offers the buyer essential information about the product's dimensions and construction. The first number, 225, tells us that this tyre has a cross-section width of roughly 225 millimetres - small variations between individual tyres are perfectly normal, so standard width categories are set at 10 mm intervals.
Closely following is the number 50. This is the tyre's aspect ratio, or cross-section height expressed as a percentage of width. Thus, an aspect ratio of 50 gives us a height (measured from the tread, the part that contacts the ground, to the rim line) equal to 50% of 225 mm (our given width).
We also have one letter in this description - the R' stands for radial construction, which is typical for passenger cars and other light vehicles. The number 17 represents the inner diameter expressed in inches, essentially informing us that this tyre can only be fitted to a 17 inch rim.
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