Forum Discussion

PointyWombat's avatar
PointyWombat
Explorer
Sep 22, 2019

Wierd Marks Appearing On Tires

These vertical marks around the tire circumfrence stared to appear on the rear tires of my 2012 silverado 3500 SRW. I recently rotated my tires and front tires did not have these marks. Since rotating, the marks have started to appear after approx 3000 miles. I tow occationally a ~11k lb. fiver. I've towed several times since rotating.

The tires are Cooper Discoverer X/T4 with approximately 35000 miles.



https://imgur.com/gallery/8L5vgwE

Any thoughts on what these indicate would be appreciated.

Thanks,
PW
Tow Vehicles
  • PointyWombat's avatar
    PointyWombat
    Explorer
    Sep 22, 2019
    ADAD437 wrote:
    looks like something is rubbing the tire when loaded.


    There is nothing rubbing and it's the same on both sides.

    Thanks.
  • PointyWombat's avatar
    PointyWombat
    Explorer
    Sep 22, 2019
    mich800 wrote:
    I have never seen a wear bar like that just the raised patches between tread blocks also shown in the pic. I looks like something is rubbing. Do they show on both sides?


    Nothing is rubbing. Same on both sides.

    Thanks.
  • PointyWombat's avatar
    PointyWombat
    Explorer
    Sep 22, 2019
    Terryallan wrote:
    I don't any thing but a the tire wearing more in the middle than the edges. Prolly from over inflation.


    Inflated to 80 PSI as per spec.

    Thanks.
  • PointyWombat's avatar
    PointyWombat
    Explorer
    Sep 22, 2019
    CaLBaR wrote:
    I think it might be a replacement indicator. With all of the sipping not sure but look like a winter or true 4 season tire. Winter tires and true 4 season tires with the mountain snowflake have a second set of wear indicators to show when there is not enough tread left to be safe in winter conditions.

    If you have the severe winter mountain snowflake on these tires I am pretty sure that is what this vertical line is.


    Yes, they are all season tires but have the winter mountain snowflake. i've not seen a wear indicaor like that before..

    Thanks.
  • Me_Again's avatar
    Me_Again
    Explorer III
    Sep 22, 2019
    PointyWombat wrote:
    CaLBaR wrote:
    I think it might be a replacement indicator. With all of the sipping not sure but look like a winter or true 4 season tire. Winter tires and true 4 season tires with the mountain snowflake have a second set of wear indicators to show when there is not enough tread left to be safe in winter conditions.

    If you have the severe winter mountain snowflake on these tires I am pretty sure that is what this vertical line is.


    Yes, they are all season tires but have the winter mountain snowflake. i've not seen a wear indicaor like that before..

    Thanks.


    Were they load forced balanced? Is the line in the same position on both tires. It does not appear to be centered.
  • OkieGene's avatar
    OkieGene
    Explorer
    Sep 22, 2019
    They look pretty well worn down. I’d measure the thread depth, I have a tire thread depth checker. Or you can take it to a reputable tire shop and have them measure it.

    Another photo from a 45-ish degree angle would show a better view of the remaining thread depth.

    Or you can call Cooper Tire at 800 854 6288, or email the pic to cooperinfo@coopertire.com and see what they have to say.

    However I think it’s definitely time to replace them. Good luck to you.
  • PointyWombat's avatar
    PointyWombat
    Explorer
    Sep 22, 2019
    OkieGene wrote:
    They look pretty well worn down. I’d measure the thread depth, I have a tire thread depth checker. Or you can take it to a reputable tire shop and have them measure it.

    Another photo from a 45-ish degree angle would show a better view of the remaining thread depth.

    Or you can call Cooper Tire at 800 854 6288, or email the pic to cooperinfo@coopertire.com and see what they have to say.

    However I think it’s definitely time to replace them. Good luck to you.


    They have 1/8th inch tread remaining.
    I will email the picture to Cooper to see what they say, but I suspect that will take a while. I'll also stop into a tire shop for an opinion.

    Cheers,
    PW
  • OkieGene's avatar
    OkieGene
    Explorer
    Sep 22, 2019
    Oh I just now saw you’re in Canada. There may be a different phone and email for you.

    I was on the .com address, I think Cooper in Canada has a .ca address.

    EDIT:: It’s the same contact info Cooper Canada

    Looks like they have a 65,000 mile / 105,000 km warranty? Maybe you’ll get a little adjustment in price? Won’t hurt to ask.

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