i bought cooper lifeliner classic II car tires. their tread depth is 7mm.?

can any body say how old these are and what is tread depth of brand new tires

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  • 1 decade ago
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    Tread depth on new tires is usually 10/32 of an inch. Some tiremakers have come out with tires that have more. And tires should always be replaced when they reach 4/32. I used to work at a repair shop for fleet (company) vehicles. As soon as they reach 4 they are replaced. Some places will tell you 3/16 which is 6/32 but that is not necessary at all. You can get a tire tread depth gauge for very cheap. Or another way to tell if they need to be replaced is to take a quarter upside down and put it in several of the grooves and if part of washington's head is covered you are fine if not, time to replace. It is hard to tell the age because you have to consider many factors: weather, types of roads, how often the person drove, how often they were rotated, city trips vs. highway trips all contribute to wear of tires. You should never put more than 2 patches on a tire and rotate them every 5,000 miles. It's good to get them balanced once in awhile too.

    Source(s): Work experience
  • 1 decade ago

    usually between 11 and 13 at the wear bar is new tire depth

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