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  • Front tires cupping!!

    Need some advice, I replaced my front tires last summer after only 10,000 miles because they were cupping pretty bad. I've been told by several people, tire shops included, that the shocks are causing the cupping. Has anybody here heard that also? I put the shocks and tires on at the same time. The shocks are Full Traction, the ones that came with the lift. If it is the shocks causing the problem what would be a good replacement? Keep in mind I would like to stay around $50.00 apiece for the shocks.

    Thanks Kevin

  • #2
    I can tell you with absolute confidence that your cupping problem is not caused by your shocks. The problem comes from running the incorrect tire pressures. It doesn't take long for this to happen either. Back when my Jeep was all stock I used to air my tires down and then drive about 15 miles to the nearest gas station to air back up. The 2 or 3 times I did that caused my tires to cup.

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    • #3
      My wifes cupped big time after 10k in the front only because I forgot to get the front aligned.

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      • #4
        Cupping has to do with the tire pressure and nothing else. Any other tire issue can be do to poor suspension geometry.

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        • #5
          Air Pressure- X3

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          • #6
            Rim Width What Size Tires???

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            • #7
              Originally posted by badtj98
              Rim Width What Size Tires???
              33 tall, 10X15 rims. Think I'm about 25psi.

              Thanks for all the input, just might be able to use that cash for new sliders instead.

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              • #8
                Tires cupping can be caused by a few different things. Shocks and out of balance tires are probably the most common. Alingment can cause some cupping if the toe measurements are out far enough. Tire pressure will not cause the tires to cup. I say this because cupping is caused by the tire moving up and down to the point the the tire practicually leaves the ground. I managed a tire and auto center for some years and used to see it quite frequently, mainly because people didn't want to believe that they're shocks were worn out.

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                • #9
                  Air pressure

                  Originally posted by khartig
                  Tires cupping can be caused by a few different things. Shocks and out of balance tires are probably the most common. Alingment can cause some cupping if the toe measurements are out far enough. Tire pressure will not cause the tires to cup. I say this because cupping is caused by the tire moving up and down to the point the the tire practicually leaves the ground. I managed a tire and auto center for some years and used to see it quite frequently, mainly because people didn't want to believe that they're shocks were worn out.

                  Really? I'm pretty sure the center of the tire wears more due to too much pressure, and the edges wear more due to too little pressure. if only one side is wearing it is shocks or allignment issues.

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                  • #10
                    Sounds like an air pressure problem. 25psi is very low.

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                    • #11
                      Start with the easiest thing and start fiddling with your tire pressure.

                      I have 35x12.50x15, and I run about 28 for street. Wearing fine. Anymore and they would wear too fast in the middle. Any less, and the edges wear. Your best bet is to color in some treads all in a line and drive it down the driveway. If the chalk is coming off in the middle too much, air down. If it's coming off the edges firsts, air up.

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                      • #12
                        I have to agree with Khartig, When I worked in auto shop and saw tires cupping the first thing we looked at were shocks.

                        I have approx. 10,000 miles on my 32x11.50,15's now and I run anywhere from 15 to 25 pounds of air in the tires----maybe I'm just lucky but I'm not having any kind of wear problems so far.

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                        • #13
                          how often do you rotate your tires??

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                          • #14
                            Originally posted by mrfast
                            I have to agree with Khartig, When I worked in auto shop and saw tires cupping the first thing we looked at were shocks.

                            I have approx. 10,000 miles on my 32x11.50,15's now and I run anywhere from 15 to 25 pounds of air in the tires----maybe I'm just lucky but I'm not having any kind of wear problems so far.
                            Probably because shocks/labor cost more than a little air.

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                            • #15
                              My experience has been tire pressure and lack of rotating them is most often the cause but bad shocks contributes to the problem also.

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