What do the size numbers on tyre sidewalls actually mean?
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What do the size numbers on tyre sidewalls actually mean? A quick explanation
Those numbers on the sides of your tyres... are they just industry gibberish that only people in the know can understand? No; they're actually quite simple and rather handy once you know what they all signify.

They're not just useful to know the next time a tyre garage asks you what size tyres your car has; they can tell you a lot about what your tyres can cope with, as well.

Let's take a common tyre size as an example: 195 65 R15 91 V:

195 - this is the width of the tyre in millimetres.

65 - this is the height of the tyre sidewall as a percentage of the width; in this case 65% of 195mm. This is also known as the aspect ratio. The lower the number, the more 'low-profile' the tyre.

R - this designates that the tyre is of radial construction, as nearly all new tyres are.

15 - this is the diameter of the tyre's inner rim in inches, i.e. the wheel size the tyre will fit onto.

91 - this is the load rating of the tyre. There's an official table of rates, and in this case 91 is 615kg

V - this is the speed rating of the tyre. This indicates the maximum speed for the tyre when at full load. Again, there's a standard table of rates, and V is 149 mph.
 

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