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Thread: tyre squirm....

  
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    tyre squirm....

    hmmmm!

    Just had 2 new falken ze-512's fitted to the rear of my astra, they replaced some Mitchelin Pilots.
    Now, I experiencing what can only be described as 'squirm'. On fast roads (upwards of 50mph) I can turn and then, milliseconds later, feel the back end sort of flex and squirm.
    When fitted they were inflated to 34psi - which I later corrected to 28psi - and it still did it with both pressures.

    I can't swop them to the front, as the Nankangs there did the same when they were on the back - cured by swopping them to the front and having Mitchelins on the back, so can anyone suggest anything?
    Has anyone experienced similar?

    cheers.
    ... indicators do not give you right of way!!!

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    Chris 16v's Avatar
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    My god - How do u find the Nagkangs?? I literally nearly died a couple of time sin my old car due to those tyres - bloody awful!!

    Out of interest in terms of quirm - what profile are they?? I dont get any squirm in mine and im on 195/55/15 yokohamas on the front and firestones on the back of my bus!
    Black Magic Seat Leon Cupra 20VT

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    The Nankangs are pretty poor really - the result of buying cheap and getting cheap.
    The size are 205/50 16.
    I expected more of these Falkens though - even though they are a mid-range tyre.


    Just reading on the web I'm finding the proper term is 'tyre wall deflection'!!!

    I think it may be a case of just experimenting with pressures!

    The case with tyres is truly you get what you pay for, so I suppose I've only myself to blame really!
    ... indicators do not give you right of way!!!

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    I have exactly the same.

    I'm not running Nagkangs (on my standard SRi rims) but my rear tyres are due to be replaced due to being worn.

    Your just losing grip on the rear tyres on the wet road surface.

    I had Nagkangs on my 18"s, but i've seen the light and swapping them over to a named tyre that actually cope with the wet.

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    I don't think the tyres are slipping/skidding at all - I think its the softness of the tyre wall that is flexing. You've got 2 fixed rigid points, the rim and where the tyre touches the road and the rubber tyre wall inbetween is flexing.
    If you could imagine having a very flat/underinflated tyre you could actually rock the car back and forwards just using the flexibility in the tyre itself.
    I defo think I need more pressure.
    ... indicators do not give you right of way!!!

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    [Goes out to check his tyre pressures]

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    .................lol
    ... indicators do not give you right of way!!!

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    Lol just done same - im running 28 on the back and 30 on the front - seems ok and even tyre wear so cant complain really!
    Black Magic Seat Leon Cupra 20VT

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    Quote Originally Posted by Keif
    [Goes out to check his tyre pressures]
    Wasn't joking tho.

    My rears are both 28PSI, which is the manufacturors recommended pressure.

    (My fronts were right too. (32PSI))

    Over inflating tyres is worse than having them under inflated, as it's only the middle of the tread in contact with the road.
    Click me

    I honestly believe it's down to the tyres (lack of) grip on the wet road.

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    ....know what you mean mate - but theres no way any loss of grip is happening here.

    Its not a major oversteer moment thing but a very slight 'twitch' thing - and it does it on dry roads too. If I do a very quick steering jerk one way or the other it exagerates it but I can still feel it on lesser movements as well though.
    ... indicators do not give you right of way!!!

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