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Meaning of tire Sizes

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Old 08-19-2010, 08:53 AM   #1
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Meaning of tire Sizes

Found this on discount tire and figured I would post it, I see people asking about tire sizes all the time and maybe this will help. Sorry if its a repost, I searched and couldnt find much on the subject. So here ya go...

The Meaning of the Tire Size Code


The tire size code consists of a string of letters and numbers as follows:
  • An optional letter (or letters) indicating the intended use or vehicle class for the tire:
    • P - Passenger
    • LT - Light Truck
    • ST - Special Trailer
    • T - Temporary
  • 3 digit number - The width of the tire in millimeters, from sidewall edge to sidewall edge.
  • / - Slash Character
  • 2 digit number - The ratio of the sidewall height to the total width of the tire as a percentage. If this is missing, it is assumed to be 82%. If the number is larger than 200, then this is the diameter of the entire tire in millimeters.
  • Construction of the fabric of the tire
    • B - bias belt
    • D - diagnol
    • R - radial
  • 2 digit number - Diameter in inches of the rim that this tire is designed to fit.
Example
The tire might be labelled:


P195/55R16
  • 'P' these tires are for a passenger vehicle.
  • 195 – the width of the tire is 195 mm at the widest point.
  • 55 – indicates that the height of the side-wall of the tire is 55% of the width - 107 mm.
  • R – this is a radial tire.
  • 16 – this tire fits 16 inch diameter wheels.
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Old 08-19-2010, 09:12 AM   #2
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http://www.tirerack.com/tires/tirete....jsp?techid=48

This link helps explain UTQG standards for tires also (tread wear, traction and temperature ratings)
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Old 08-19-2010, 06:14 PM   #3
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Quote:
Originally Posted by Pugga View Post
http://www.tirerack.com/tires/tirete....jsp?techid=48

This link helps explain UTQG standards for tires also (tread wear, traction and temperature ratings)
Which is also accurate only when comparing tires of the same manufacturer.
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Old 08-19-2010, 06:16 PM   #4
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Quote:
Originally Posted by Archangel View Post
Which is also accurate only when comparing tires of the same manufacturer.
Yeah, that's a good catch. Even though it's supposed to be a standard it definitely varies from manufacturer to manufacturer.
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Old 08-19-2010, 06:40 PM   #5
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When they came up with the Uniform Tire Quality Grade (UTQG) was that the Uniform Tire meant the same manufacturer
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