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Can you run different width (225 & 235) tyres on an A3 Quattro?

Discussion in 'A3/S3/Sportback (8P Chassis)' started by MG, Mar 16, 2013.

  1. MG

    MG Member

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    I'm running 19" 8.5J Alloys with 225/35 tyres all round on my A3 2.0T Quattro so there's a bit of stretch. However, I got a bad puncture the other day and need to replace two of the tyres. I wanted to take the opportunity of fitting a pair of 235/35s as I'm positive they'll fit (and will offer the rims more protection) but the garage has advised all four tyres need to be same size.

    I don't want to replace all of the tyres as two of them have loads of tread left. I can understand you not having different size profile tyres as I guess you could potentially have the front and rears rotating at slightly different speeds but I'm unclear how having a 10mm wider set of rear tyres would adversley affect the car.

    Any guidance would be greatly appreciated!

    Thankss
     
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  3. coreythorny

    coreythorny Member

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    It's the rolling diameter which would change.

    Your width is now 225mm with a 35% profile which is calculated by 35% of the width.
    The new one is 35% of 235mm.

    So your difference in rolling diameter is 3.5mm.



    Not a massive amount, having tyres with more tread on the rear is similar.
     
  4. MG

    MG Member

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    OK, thanks I appreciate your reply. So given the Haldex system is not like a full 4x4, would you say this is an acceptable difference or is it likely to cause problems? Ultimately I would like to change all tyres to 235/35/19s but at the moment two of the tyres have a good 5mm on so, so my preference would be to not just throw them away.
     
  5. MBK

    MBK Well-Known Member

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    I can assure you it will be fine, the RS3 runs 235/35 (or 255/30) front and 225/35 rear. Cars are not that sensitive to a slight tyre size change - I suspect the garage would just like the profit of 4 tyres rather than two. I'm assuming you do mean running a front or rear pair not opposite side!
     
  6. MG

    MG Member

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    Excellent, cheers for your help. A pair of 235/35s it is then!
     
  7. Staz

    Staz is a retronaut
    Staff Member Moderator VCDS Map User

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    A difference in tyre pressure might give you that much difference in circumference so I can't imagine it would cause any issues!
     
  8. BahnStormer77

    BahnStormer77 BahnStormer

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    By the sound of the replies you've got, this type of thing is okay on Haldex, but just in case an A4 (or above) owner picks up on this thread, I assure you it is NOT okay for Torsen differentials: 3.5mm difference plus 3mm in tread difference would massively overwork the rear diff and cost a grand or two for the sake of two new tyres.

    Check in your log book or with your local Audi dealer if in any doubt.
     

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