You're logged in

Giving you the benefits you don't get from insurance

What do the size numbers on tyre sidewalls actually mean?

What do the size numbers on tyre sidewalls actually mean?

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.

Read another article

Assist Protect Ltd is regulated by the Data Protection Act 2018 and is registered with the Information Commissioner's Office, ref. Z2148051. Registered office: Mercia Place, 2 Main Street, Repton, Derbyshire, United Kingdom, DE65 6EZ. Company No. 7184256.

© Assist Protect Limited. All rights reserved.

AssistProtect, the AssistProtect logo and all the logos of Assist Protect Ltd's products and services are trademarks of Assist Protect Ltd.
The website and its designs are solely owned by Assist Protect Ltd.