[A4] Replacing a Partly Worn Tire?

[Sean Reifschneider]

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On 04/27/2010 05:41 PM, Stephen Kormilo wrote:
> ~$240 each installed with all taxes. Will the difference in diameter 
> between the new tire & the old ones cause driveline problems, or is the 
> difference inconsequential? Are there any other factors that could cause 

I once had a tire blow out 12 hours away from home.  I'm pretty picky on
tires and didn't have much choice on where to get a replacement.  They were
trying to sell me on getting 4 new tires so I didn't break the AWD, but I
said I was pretty sure I was ok because the wheels are almost always
turning slightly different speeds because wear and not going exactly
straight, etc...

But, I called Audi Of America's hotline, and they confirmed it:

   As long as you are talking the same size tire, differences in wear will
   not damage the Quattro system.  So, if you have 3x 220 40 R 18 tires on
   it and you put a new 220 40 R 18 tire on it, you're fine.  DO NOT put a
   220 35 R 18 on it, for example.

That's what Audi told me.  The exact car in question was a 1997 A4 2.8Q
(which didn't have the above tire sizes on it, I don't remember what they
were, the above are closer to what my S4 wears, I just replaced two of
them).

Sean
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