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  1. #1
    Active Member One Ring abbottcostello's Avatar
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    Nov 24 2018
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    431790
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    1967 Porsche 912, 1976 Porsche 924
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    Buffalo, NY

    Maximum Tire Size for my A4

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    Hello all!
    I've just purchased a '07 A4 Avant 6sp MT, the tires on the car now are 235/45 R 17's.

    I want to get a set of snow tires on winter rims & found a set of used Nokians for sale. They were used on an A8 and the size is 235/55 R 17. If I'm doing my math right my tires have a dia. of 25.33" and the Nokians have a dia. of 27.18".

    Will these fit in my wheel wells with no problems or modifications??

  2. #2
    Veteran Member Four Rings dalmation53's Avatar
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    Aug 20 2013
    AZ Member #
    121389
    My Garage
    Audi A4 B7
    Location
    Orlando, FLORIDA

    They will fit.

    Sent from my Vivo One Plus using Audizine mobile app
    Ivan

  3. #3
    Active Member One Ring abbottcostello's Avatar
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    Nov 24 2018
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    431790
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    1967 Porsche 912, 1976 Porsche 924
    Location
    Buffalo, NY

    Thanks for that, was pretty sure just from what looks like an abundance of room in the wheel wells, but it's always nice to have some confirmation. I was probably going to buy them anyways, as I could use just the rims for the price he's asking and still feel like it was a good deal!

  4. #4
    Senior Member Four Rings Dondbg's Avatar
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    Mar 12 2016
    AZ Member #
    370140
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    MB w203
    Location
    New Zealand

    This will mess you Speedo reading and the ABS since the diameter is bigger.

  5. #5
    Active Member One Ring abbottcostello's Avatar
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    Nov 24 2018
    AZ Member #
    431790
    My Garage
    1967 Porsche 912, 1976 Porsche 924
    Location
    Buffalo, NY

    Wow, got a little sidetracked by possible TPMS issues, (after some checking, my car doesn't have that option!), but never even entered my mind that oversized tires would possibly affect the ABS! How darn intelligent are these cars? All 4 tires are identical in size, so as long as they rotate at the same speed relative each other, I would think everthing should be all good.

    Please educate me as my experience with all this electronic wizardry is extremely limited - my daily driver up to last Thursday was a 1986 Landcruiser & the only thing that got it upset was an alert if I left my keys in the ignition

  6. #6
    Veteran Member Three Rings JayDog747's Avatar
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    Mar 10 2010
    AZ Member #
    55865
    My Garage
    2007 S4, 2008 Subaru Outback,2015 Silverado,08 A43.2
    Location
    WI

    The new diameter needs to be within 3% of original size. 235/55 17 are at 7% causing the speedometer to be 5mph slower @65

  7. #7
    Active Member One Ring abbottcostello's Avatar
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    Nov 24 2018
    AZ Member #
    431790
    My Garage
    1967 Porsche 912, 1976 Porsche 924
    Location
    Buffalo, NY

    Yeah, if that's the only thing it doesn't make it off the bottom of my "Things I Need to Worry About" list!

    On previous vehicles, I usually take on the expressway (with mile marker posts) & make a run, at 60 mph 1 mi. will take 1 minute. Once I think I have it I'll do at least a 10 mi. run to verify. There is probably even a way to actually correct the speedo with something like VAG-COM, but I don't have that so...

    I'm curious about what Donbg brought up regarding the ABS sys, wouldn't like it if I wound up with ABS going offline due to tire size!

  8. #8
    Senior Member Two Rings
    Join Date
    Dec 14 2011
    AZ Member #
    85264
    Location
    Chagrin Falls, Ohio

    If all 4 tires are the same size it will not effect the ABS. ABS, traction control and stability control only look for differential in wheel speed. Spedo may be off.

  9. #9
    Established Member Two Rings
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    Apr 26 2015
    AZ Member #
    329586
    Location
    south charleston WV

    i'm running 235/45/18's on my 08 a4 avant 6 speed with the "JOM blueline" coilovers with a 1.5" drop front/rear i do get some tire rubbing when i hit bumps hard or have the back end loaded with heavy stuff.

  10. #10
    Established Member Two Rings
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    Feb 12 2018
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    413935
    Location
    Toront/Ontario/canada

    What air pressure to run on 235 40 18.

  11. #11
    Veteran Member Three Rings JayDog747's Avatar
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    Mar 10 2010
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    2007 S4, 2008 Subaru Outback,2015 Silverado,08 A43.2
    Location
    WI

    Quote Originally Posted by Adams-Allroad View Post
    What air pressure to run on 235 40 18.
    It depends on what car they are on. My S4 requires 44 up front and 32 outback. Where as my A4 takes 35 up front and 32 in the back. But WTF does that have to do with what the OP was asking!

    Reiterating what Silveravant stated, it's not going to effect the abs. What you do want to check is the diameter of the hub of the A8 wheels. If it's larger than the A4 wheels, you will have to get rings to fill the gap or you will get vibrations.

  12. #12
    Veteran Member Four Rings A4_PimP's Avatar
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    Jan 18 2012
    AZ Member #
    86834
    Location
    Waterdown/Ontario/Canada

    Like JayDog747 said you need to check the hub or center bore to see if you need an adapter. As an example the 2007 A8 is 57.1 which is the same as the A4 so you would be good. If you want to see the difference from one setup to another I usually use https://www.willtheyfit.com/index.ph...h=9&offset2=33

  13. #13
    Active Member One Ring abbottcostello's Avatar
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    Nov 24 2018
    AZ Member #
    431790
    My Garage
    1967 Porsche 912, 1976 Porsche 924
    Location
    Buffalo, NY

    Thanks for all the input guys, I think if macantley is running 235/45R18's on a 1 1/2" lowered A4, then I should be ok as far as clearances with stock ride height. I really didn't think that it would affect the ABS system. So I think they should be OK, I just need to see if I need hub spacers, he may even have them if the rims are bigger than 57.1mm



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