RE: Larger wheels screw up quattro?

[Mike Sylvester <Mike.Sylvester@aptis.com>]

Wheel diameter or tire diameter?  The wheel diameter should not matter at
all.
Its the tire diameter that is the issue.

If you have a tire diameter difference of 2" from front to back in an older
quattro, 
say an '87 5KCSTQ and you were to lock the center diff, I would expect a 
severe problem.  An increase of 2" in diameter would be a 6.3" difference in

rolling distance per revolution.  The smaller tire could not keep up.  Since
the
diff is locked the car would not move very far or you would break something.

The A4 with the automatic center diff might be OK, but it might start to
lock the 
center diff because of the difference in tire rpm.

None of this applies, of course, if ALL of the tires are changed to a larger
size.
Then only the speedometer is wrong.


Mike Sylvester

94 100CS Q
86 5KCSTQ

> -----Original Message-----
> From:	Dave Ohlemacher [SMTP:Dave@ohlemacher.com]
> Sent:	Wednesday, February 03, 1999 9:01 AM
> To:	Jason Palmer
> Cc:	quattro@coimbra.ans.net; Rob Andrews
> Subject:	Re: Larger wheels screw up quattro?
> 
> I agree with Rob.
> 
> The only time sizing will 'screw anything up' is with ABS, guidelines from
> Bosch are that the front and rear wheel diameters shouldn't differ by more
> than 2-3"
> 
> Dave
> 91 200tqw
> 
> Jason Palmer wrote:
> 
> > He didn't buy an A4 because someone told him using a different sized
> > wheel would 'screw up' quattro?
> >
> > But +1 or +2 sizing on all 4 wheels and using the proper tire sizes
> > Plus sizing system will not result in 'screwing up' quattro.
> >
> > > I was out looking for some car audio stuff today and
> > > the guy started talking about my a4.  He said he
> > > didn't get one because one of the audi techs told him
> > > he has seen problem with cars with quattro getting
> > > screwed up because larger wheels were put on them...
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>