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  1. #1
    Jack
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    What causes tires to cup?

    Anyone know what can cause tires to cup?

    My last two sets of tires on my '99 328i have all had very bad cupping.
    these last set (Dunlop SP Sport A2) with only 7k miles on it has about 1/2 tread worn and is extremely noisy now at 40mph. Dealer and tires store both says the noise is from cupping. Dealer says cupping is due to bad tire design, tire shop says cupping is from bad alignment. (I had a 4 wheel alignment done right after the tires were installed.)

    Previous set of tires (Dunlop SP Sport 5000) also had very bad cupping but managed to last 50k miles and weren't as noisy.

    So what causes cupping? I want to get it fixed before I get the tires replaced again.

    Thanks

    Jack


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    Alignment mostly i would say


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    Re: What causes tires to cup?

    From what I've been told and experienced, Out of alignment can contribute to cupping but primarely it's the particular tire tread design configuration ie large block tread designs seem to be more prone to cupping as compared to a smaller tread block design. The cupping seems to mainly occure on the large block shoulders of the tires. Any other ideas?

  4. #4
    CalVol_330i
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    Mostly bad shocks cause cupping...

    because the tire isn't held firmly to the road surface... try new shocks every time you replace the tires, and that should fix the problem...

  5. #5
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    Tire cupping fairies

    :)

    Has it been getting cold out? First thing I'd do is check your tire pressure.



  6. #6
    Jack
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    32/36 front/rear, checked weekly

    tire pressure has been set at 32 front, 36 rear, and has been checked and adjusted weekly (every sunday morning).

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    bad shocks get my vote, as tires hop over bumps


  8. #8
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    The skinny on cupping

    Cupping can be caused by an unbalanced tire condition, faulty wheel bearings, loose suspension parts, unbalanced tires, fatigued springs or weak/broken shock absorbers. The cupping is not an 'uneven' wear like excessive toe-in/out would cause, itís an 'intermittent' scrubbing of rubber from the tire.

    Camber or toe wear indicates misalignment due to loose, worn or bent steering linkage components. Many camber and toe wear problems can be traced to spring fatigue, which causes the vehicle's frame to ride closer to the road. Once the vehicle is below the manufacturer's height specifications, it is not possible to achieve the correct camber change designed into the suspension without replacing the springs. The vehicle also experiences excessive toe change as the suspension travels through jounce and rebound, again causing abnormal tire wear. This principle also applies to after-market mods for lowering the vehicle. My 330xi has "sport suspension" which really is dofferent that the normal setup (which is good BTW). Taking the normal components, and just installing shorter springs can cause pre-mature tire wear. Sometimes you just can;t adjust the camber/caster enough to overcome the ride-height.

    Diagonal scuffing and cupping across the face on rear tires signals problems with toe. Diagonal tread wear or cupping on rear tires is caused when the direction the vehicle's wheels are heading is not in line with the geometric center line of the vehicle. When this condition occurs, front-wheel steering can be affected and lead to tire slip or loss of traction or control. (Note: The wear pattern that develops on rear tires from improper toe will vary depending on tread design. Wear patterns from rear-wheel misalignment may resemble cupping on tires with highway tread design and diagonal scuffing on tires with an all season tread pattern.)


    On these cars with IRS (or the Xi's particularly) a 4 WHEEL ALIGNMENT is highly advised. A very reliable source has told me that thrust angles are fully adjustable on the E46.

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