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Thread: Any thoughts on this?

  1. #1
    Regular Member Derek Mc's Avatar
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    Default Any thoughts on this?

    I have 4 Pirelli P7 215/50 x 17 tyres on the car all fitted and balanced at the same time and the car drove wonderfully smoothly and had no vibrations or strange wobbles.

    The tyres are not directional but assymetric (marked outside on the outside,,,) I did the diagonal swap front n/s to o/s rear and vice versa.

    On the motorway at 70 ish I get an intermittant vibration, it comes and go's!!!

    I checked torque on the studs I looked for a thrown weight but it looks fine, so apart from one wheel perhaps not being im-properly balanced back in May, why would this show up as there was no problem or vibration from the back-end before.

    Never come across this before anyone got any thoughts or theories?

  2. #2
    Regular Member Guss's Avatar
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    hi...
    how old are your tires? whats the tread wear like. i have found with some tires once you hit the visual tread wear nodes"for want of a better word" thats the raised rubber bit inbetween the tread this can cause vibrations..
    Russ

  3. #3
    Regular Member Derek Mc's Avatar
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    Tyres are about 7mm rear and 6mm front before the swap round (they were new in May )

  4. #4
    Regular Member tangoman's Avatar
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    Vehicle : VXR Estate

    Trim : VXR

    Engine : 2800

    Year : 2008

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    you will always feel an imbalanced wheel thru the front as you'll feel it thru the steering wheel.
    may be worth getting the fronts rebalanced.

  5. #5
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    Quote Originally Posted by Derek Mc View Post
    I have 4 Pirelli P7 215/50 x 17 tyres on the car all fitted and balanced at the same time and the car drove wonderfully smoothly and had no vibrations or strange wobbles.

    The tyres are not directional but assymetric (marked outside on the outside,,,) I did the diagonal swap front n/s to o/s rear and vice versa.

    On the motorway at 70 ish I get an intermittant vibration, it comes and go's!!!

    I checked torque on the studs I looked for a thrown weight but it looks fine, so apart from one wheel perhaps not being im-properly balanced back in May, why would this show up as there was no problem or vibration from the back-end before.

    Never come across this before anyone got any thoughts or theories?
    If it's intermittent then it sounds like one or both steering arm balljoints are worn. Both mine were worn, and when I replaced them the vibration disappeared.

  6. #6
    VIP-Member Johnsdutton's Avatar
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    Vehicle : Signum

    Trim : Elite

    Engine : 3.2 v6

    Year : 2004

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    I know it may sound daft Derek but what road were you on at the time? Reason I ask is that I got terriblle vibration on the road past the Heritage loch in EK. And also the A726? EK expressway as you pass the top end of Blantyre, and a slip road as you come out of Righead ind est at bellshill. The vibration was so bad I thought the wheel s were falling off, turns out it was just a very bad road surface.
    3.2 v6 Signum and loving it

    http://www.freewebs.com/johnsdutton/

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    Regular Member m8internet's Avatar
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    This is a known issue on part-worn tyres, which are then rotated
    If you have crossed them across the car, the issue can be worse
    As above, when rotating tyres it can be prudent to see if rebalancing is required, the usual symptom is vibration at constant speed
    The issue is often not felt when the balance on a rear tyre is incorrect

    As you probably already know I rotate my tyres as they wear and quite often I have to have the front tyres (previously on the rear) rebalanced
    It is just pure luck, but the most usual cause is higher mileage than normal on the rear or simply one or more of the weights falling off (very common on alloys)

  8. #8
    Regular Member Derek Mc's Avatar
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    Quote Originally Posted by m8internet View Post
    This is a known issue on part-worn tyres, which are then rotated
    If you have crossed them across the car, the issue can be worse
    As above, when rotating tyres it can be prudent to see if rebalancing is required, the usual symptom is vibration at constant speed
    The issue is often not felt when the balance on a rear tyre is incorrect

    As you probably already know I rotate my tyres as they wear and quite often I have to have the front tyres (previously on the rear) rebalanced
    It is just pure luck, but the most usual cause is higher mileage than normal on the rear or simply one or more of the weights falling off (very common on alloys)
    Hi, thanks I did wonder about the crossing of them hence reversing their previous wear patterns, so might get them re checked.

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