All tyres feature a coding system that explains their technical capabilities. Built into the sidewall, this code provides information on the tyre's construction, size, load carrying capaicty and speed rating. 

A = Section width of the tyre (in millimetres)

In this example it shows that the tyre is 305mm wide.

B = Aspect ratio (percentage of width)

In this example the ratio is 30%.

C = Rim diameter (in inches)

In this example it shows that the rim is 19" in diameter.

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