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Quattro question

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by S23, Oct 22, 2012.

  1. S23
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    S23 Member

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    [Oct 22, 2012]
    I'm running staggers wheels on my 1.8t Quattro 8.5f and 9.5r after putting these on the drive feels weird abit shakey , does running different size wheels affect the 4wd system the tyres are 225/40/18

    my other thoughts are tracking should I get this looked at ?
    Just wondering if anyone else has had an issue similar to this
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  3. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    [Oct 23, 2012]
    from my understanding, and i may be wrong, the quattro system likes all 4 wheels to be the same,
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  4. Mike.M
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    Mike.M Well-Known Member

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    [Oct 23, 2012]
    As above really. Due to having permanent 4x4 you will have a different rolling radius from front to back as the rear tyre is stretched on a wider rim........in short the rear wheels are trying to turn faster than the front

    You could get a wider tyre with lower profile to get a close rolling radius as the front but then the grip goes to pot also.

    It's good practice to have the same size alloy and tyre all round on a 4x4
    #3
  5. S23
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    S23 Member

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    [Oct 23, 2012]
    Ok thanks guys think in going to for for some bbs lm or just a set of rs4 wheels
    #4
  6. Greeny233
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    Greeny233 Active Member

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    [Oct 23, 2012]
    I'm running staggered rims on my Quattro 8.5 front and 9.5 rear with 235/35-19s all round and have no problems at all.
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  7. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Oct 23, 2012]
    I think the theory that you should have all four wheels the same is 100% sound, but .... the difference in rolling radius would be pretty minimal. If your vibration is that bad, then I would look at other issues before rushing out for new wheels.
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  8. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Oct 23, 2012]
    If the rolling radius is within 5% i think it is, you are fine. So assuming you have the same tyres fitted front and rear but one set with some stretch, I think it's more likely something else causing your problem. The quattro system has no way to know what width the tyres are but the radius can affect it
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  9. bugwhizz
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    bugwhizz Member

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    [Oct 23, 2012]
    I run 8.5" and 9" on mine and there are no issues.

    thats with the same size tyre allround

    Are the tyres you are running new? or part worn as some part worns tyres have tread blocking, ie uneven tyre wear!
    #8
  10. S23
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    S23 Member

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    [Oct 23, 2012]
    There brand new Kenda 225/40/18
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  11. archemist
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    archemist Member VCDS Map User

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    [Oct 24, 2012]
    if you're running the same tyres f+r then apart from the 'stretch' they're the same rolling radius.

    225's on a 9.5 are well outside recommendations tho (i know nothing about the stance and stretch biz tho) which suit 255 or 265's. (7.5" / 8" are a 225 fit)
    #10
  12. pink.teg
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    pink.teg Member

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    [Oct 25, 2012]
    I have 8" f. And 9" r
    same size tyres and its all good
    235/40/18

    oh do you know if its cool to have 18" x8.5j ET 20
    on an A4 B6
    #11
  13. marktdisport
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    marktdisport Active Member

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    [Oct 25, 2012]
    225 on a 9.5 rim seems a bit to much to ask IMO... I'd say you need at least need 235's min.... This why is may seem strange
    #12
  14. Greeny233
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    Greeny233 Active Member

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    [Oct 26, 2012]
    I'd start with having the wheels balanced and check the wheels are centred on the hubs correctly (check there are spigot rings if the wheels require them)
    #13
  15. Ian2012
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    Ian2012 Active Member

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    [Oct 29, 2012]
    Having run all sorts of quattro's over the last 20 years I have never heard of running staggered wheels on them, I have heard that running wheels of different rolling radius's winds the transmission up eventually leading to a gearbox blow up. the only quattro I ever had with a gearbox problem was one that had previously been driven with odd sized on, (mot failure sheet to prove) not long after the box blew.

    I wouldn't use odd sized tyres or staggered rims, Audi don't either!
    #14

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