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When getting new tires and a seller refers to a tire with a 60,000 mileage life does that mean that the actual tire is expected to reach a full wear pattern by a certain thickness or is that from a tested failure rate around that mileage? Though, Ive never been able to actually get the full mileage life of a tire even rotating and balancing during the suggestive intervals I've always wondered what the milage life meant when considering new tires.

  • I believe it is expected mileage for a tire. It can be more or less in practice depending on the roads and driving style. – Vladislavs Dovgalecs Apr 12 '16 at 20:44
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When shopping for tires, some of them will have a mileage warranty, normally in the range of 40,000-70,000 miles. When a mileage number is listed, it is a pro-rated tread life warranty. When the tires are kept properly inflated, and rotated on a strict, verifiable schedule, they should give you the listed number of miles before the tread reaches the minimum safe tread depth (typically 2/32".. Which of course is 1/16", but everyone insists on calling it 2/32" for some unknown reason).

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Typical tire mileage warranty advertisement

If the tires fail to last that long, and you can verify the rotations, and the tread wear pattern doesn't show any problems with inflation or alignment, then you will be entitled to a warranty claim based on the difference between miles traveled and the miles promised. As you can imagine, meeting all the requirements is a challenge, and in the end you're probably only going to get maybe 20% of the purchase price of only the tires, so most people don't bother unless the tires really under-performed.

Sport or specialty tires rarely have a mileage rating, but all tires should have a Uniform Tire Quality Grading (UTQG) rating (in the US). This value is a non-milage based number that ranges in the typical range of 400s-700s. This is a good number to keep an eye on rather than miles because it attempts to be standardized across brands. A manufacturer can put whatever mileage warranty they want, but the UTQG must be tested.

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UTQG stamp on sidewall of a tire

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    Speaking of 2/32", I would presume because the gauge reads that way, and to get around the need for conversions. Say you get your tread measured, and they tell you there is 1/4" inch left, you get it read later and they tell you 1/8, then they tell you its 3/32, then finally "It's time to replace your tires, they are at 1/16" and having a customer be confused. Instead they would say 8/32, 4/32, 3/32, 2/32 and it presents a ground base for comparison even if they are bad at math. It is an unfortunate side effect of our imperial measurements and cultural math illiteracy... – wedstrom Apr 12 '16 at 18:19
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    @wedstrom Not necessarily math illiteracy in the USA but just a basic problem of comparing fractions isn't simple. I'm guessing it's one of the biggest reasons that virtually the entire world uses the metric system. – Xen2050 Apr 13 '16 at 4:17
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I would assume it's a calculated estimate, based on an "average" wear rate for the compound used - I'd expect that they would run the tyre in controlled conditions for a certain mileage, measure the wear, and extrapolate out to give a full wear life.

As with all these things, the controlled conditions of the test means it's unlikely that many people would achieve it in real life...

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The testing for tires has components in them which I find nefarious and not realistic. I've never had a 60,000 mile tire last the anticipated distances. My driving 'style' is most probably the delta between the testing regiment and what I actually get out of a 60,000 mile tire.

  • I got 50,000 miles out of a set of tires (the rated life), they were 13 years old when I replaced them. The car was given to me by someone else, and they only used it for city driving, if that makes any difference. – user15009 Apr 12 '16 at 18:42
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About 4 years ago, I bought a set of General Altimax RTs for my 2007 Camry. On a dangerous driving scale of 10=highest, I'd say I drive around a 7. Almost always 10-15MPH over the speed limit on freeway and aggressive starts. My Camry has a V6 which has more than enough power to spin the wheels if I try hard enough. With this said, 4 years later, those Generals have gotten a lot louder, but their tread (UTQG ~700) is hovering at about 5/32 which puts them at about 50% used up. Over 50K on the set with rotations about once every two years and a lifetime alignment check every year, these tires have far exceeded what I was expecting from a General Tire. The downside is they don't like it when it's raining out. Rain traction is nearly non-existent- have to granny throttle it. But on dry days - look out! 50K miles and likely will get 70K before finally going after another set - probably the newer RT43!

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