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Tyre help

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by czm, Jun 24, 2013.

  1. czm
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    czm Member

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    HHi have just got a set of RS4 5 spoke alloys for my 1.8t Avant

    I was going for standard 235/40 18 but I have been offered a pair of mint 235/35 18.

    could/should I run these on the front with the 235/40 on the rear?
    other than the slight speedo change is there any other issue to prevent this set up.
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  2. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    You running fwd or quattro?
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  3. czm
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    czm Member

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    Fwd m8
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  4. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    It'll be fine then :thumbsup:
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  5. krisavant
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    krisavant 4th set of a wheels in a year

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    May look a little odd though being a lower profile on the front and perhaps a tad harsher over bumps.
    Other than that, will be fine.
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  6. czm
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    czm Member

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    Do you think

    My previous 330 BMW touring had 35's front and 40's rear and it did not look add at all.
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  7. DieselJake
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    DieselJake God Mode

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    Should be fine, ran a similar setup on 19's with no issues (and no quattro malarkey haha). Eventually bit the bullet and went 35 all round, prefer same at each corner. Just remember tyres are economy, speed, breaking, handeling, etc... also money though.
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  8. Mike.M
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    Mike.M Well-Known Member

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    The only issues I can see is that you speedo will not be accurate as you are reducing the rolling radius of the wheels and the ride may be marginally harder due to the reduced side wall
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  9. krisavant
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    krisavant 4th set of a wheels in a year

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    Ok fair enough but with the tyres being the same width the 5% difference must have been noticeable side on?
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  10. jutlis 3.0
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    jutlis 3.0 Member

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    bmw's usually have 40 front and 35 rear and run a staggered set up on most e46 running 18's. in your case with the audi i can't see it would hurt and would bearly be noticable if you were to run the set up you talk of
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  11. archemist
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    archemist Member

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    It's still normal to have the wheel centres level and all the tyres the same rolling radius (and circumference).

    An M3 running 225/40's and 255/35's 18" staggered has 1mm different rolling radii, although the tyres are 30mm different in width. The tyre's sidewall height will be near as exactly the same.

    I'm not saying it's a great difference but if you've gone to the trouble of designing and making a car with near 50/50 weight distribution and equal corner weighting you're going to specify the tyres so it runs level.

    The sidewalls of the 35 tyres in the OP's post are 9mm shallower and, if, on the speedo axle will be out by about 5mph.
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  12. SuperV8
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    SuperV8 Member

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    My previous 330 BMW touring had 35's front and 40's rear and it did not look add at all.
    BMW 330 have different width tyres front and rear. The 35 is a percentage of the tyre width in height.

    Also how about the ABS?
    It will see different wheel speeds so may make the ABS play up.

    Tom.
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