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Thread: Damage to Tyre

  1. #1
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    Default Damage to Tyre

    What an earth caused this damage to my rear o/s tyre ? (see pictures)

    The car passed an MOT less than 3 months ago and I had previously had new shocks fitted (previous owner said new springs had been fitted some 12 months ago as well). To pass the MOT I had to have new rear upper suspension arms fitted (described as control arms and cost £70 each - x 2 ) . There was previously some uneven wear to the insides of both rear tyres and I was hoping that this was now fixed. The garage is a very reputable dealer although not main agent.

    I have looked inside the wheel arch, with wheel removed, and can see NO signs of any bright metal which would indicate what has been rubbing on the tyre. It is OK on the emergency spare but I, obviously, will need to replace that with a new tyre.

    So what has caused this ? Any idea's please ?

  2. #2
    Regular Member lee gsi's Avatar
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    Did you have a 4 wheel camber/tracking etc done after having the suspension sorted?

    If you change the rear arms you NEED to get it checked.

  3. #3
    Regular Member TimTay's Avatar
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    nasty case of bad alignment or a very badly worn part. how did you not notice that kind of wear!

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    Default Tracking

    I would have assumed that the garage was knowledgeable enough to do so but cannot be certain (no mention on the invoice). Would that cause the damage on the rear tyre ? It looks as it something has been in contact with the tyre and it is down to the cord in places . Scary, eh ?

  5. #5
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    Default Wear

    It went flat, slowly, luckily, but I had been on a motorway some 10 mins previously !

  6. #6
    Regular Member lee gsi's Avatar
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    Not many 'garages' have access to 4 wheel alignment machines but would have thought they would have told you it would need to be done asap,

  7. #7
    Regular Member m8internet's Avatar
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    As above, on completion of the suspension repair and further check for items with play or worn, then a full alignment would be required
    Equally, if the tyre has always been on the rear then any previous wear will accelerate as the tyre wears
    The solution is to swap tyres rear to front as they wear (rears wear inside edges, fronts typically wear outside edges)
    The new tyre on the rear should then wear more evenly

    The wear itself looks like the signs of a worn / failed shock absorber (which causes this unusual wear pattern you can see)
    If the other tyre simply has uneven wear then there is compounded (both sides) wear of uneven camber and failed shock absorber (one side only)

  8. #8
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    Quote Originally Posted by m8internet View Post
    As above, on completion of the suspension repair and further check for items with play or worn, then a full alignment would be required
    Equally, if the tyre has always been on the rear then any previous wear will accelerate as the tyre wears
    The solution is to swap tyres rear to front as they wear (rears wear inside edges, fronts typically wear outside edges)
    The new tyre on the rear should then wear more evenly

    The wear itself looks like the signs of a worn / failed shock absorber (which causes this unusual wear pattern you can see)
    If the other tyre simply has uneven wear then there is compounded (both sides) wear of uneven camber and failed shock absorber (one side only)


    Mine started going lie that on the inner edges. Changed the upper arms, springs and shockers, had 4 wheel alignment done (camber and toe). New tyres fitted, and no uneven wear at all. AND the car drives a lot smoother (used to "wander" at the rear end).

  9. #9
    Regular Member mattv6diesel's Avatar
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    When tyres on the rear step it causes very fast wear on the inside. The rest is nearly bold

  10. #10
    Ex Vec-C Admin Deztroyer's Avatar
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    Default

    As already said the wear is called Cupping
    Cups or scalloped dips appearing around the edge of the tread on one side or the other, almost always indicate worn (sometimes bent) suspension parts. Adjustment of wheel alignment alone will seldom cure the problem. Any worn component that connects the wheel to the car (ball joint, wheel bearing, shock absorber, springs, bushings, etc.) can cause this condition. Worn components should be replaced with new ones. The worn tire should be balanced and possibly moved to a different location on the car. Occasionally, wheels that are out of balance will wear like this, but wheel imbalance usually shows up as bald spots between the outside edges and center of the tread.

    In your case rendering the tyre illegal

    0-Large smile ......every time it's driven

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