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Thread: Cooper STT

  1. #1
    Caught the Bug danford.lau's Avatar
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    Cooper STT

    Anyone have comparison of how the 315/70/r17 stacks up to the 35x12.5x17?

    Looking at the 315s in load E , 10 ply .

    Responses appreciated !


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  2. #2
    Administrator wayoflife's Avatar
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    They're essentially the same size. The 315 will be a bit bigger and the load range E is something that I would recommend.

  3. #3
    Nothing but a Thing ob_tj's Avatar
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    I had the 315/70/17s on my JKUR when we went to moab this year and they worked very well. Saw on your description you have a 2.5” lift. I had the same and it was plenty to clear the tires and still get good flex on the trail.


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  4. #4
    Fresh Catch GTJeeper's Avatar
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    I run the 315’s on my 2 door. They have quite a few trail miles and they’ve performed great for me on dirt, rocks, and mud.


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  5. #5
    Old Timer TrailHunter's Avatar
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    Quote Originally Posted by wayoflife View Post
    They're essentially the same size. The 315 will be a bit bigger and the load range E is something that I would recommend.
    I thought it was the other way around... 315’s run a tad smaller than a “35”?

  6. #6
    Caught the Bug danford.lau's Avatar
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    Quote Originally Posted by TrailHunter View Post
    I thought it was the other way around... 315’s run a tad smaller than a “35”?
    This was my assumption as well . If 315s are bigger then I should go for a set of those


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  7. #7
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    Quote Originally Posted by danford.lau View Post
    This was my assumption as well . If 315s are bigger then I should go for a set of those


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    Check out this website. I used it frequently when I was planning my upgrade from stock. https://tiresize.com/calculator/


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  8. #8
    Nothing but a Thing Clutch's Avatar
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    That site shows 35s being bigger. Maybe it’s a stated size vs true size thing.


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  9. #9
    Meme King WJCO's Avatar
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    Quote Originally Posted by danford.lau View Post
    Anyone have comparison of how the 315/70/r17 stacks up to the 35x12.5x17?

    Looking at the 315s in load E , 10 ply .

    Responses appreciated !


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    Are you wanting the stt pros? I just looked at Cooper's website, tire rack, and discount tire's. It doesn't appear Cooper makes a 35x12.5R17 for the stt pro.
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  10. #10
    Hooked
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    Cooper STT

    I just checked coopers website tire specs for the stt pros. Though they don’t offer a 35x12.5 in a 17 they do for a 15. The 35x12.5R15 and the 315/70R17 have the same overall diameter at 34.57”. Tread width is .08” wider on the 12.5” at 10.08” and the section width is .5” wider at 13.1”.


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    Last edited by TC1201JK; 09-15-2018 at 04:58 PM.

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