Wheel size suggestions needed ASAP for my 1990 AudiQuattroCoupe....

[Todd Young]

Ouch, I stand corrected.

Grant Lenahan wrote:

> I dont think so.  Offset is measured from the *center*.  The center never
> moves :-)
> Rather, width is added to each side fo the centerline.  See the nice
> diagram on Tire Racks site if you doubt this.
>
> Am I wrong?  (certainly possible, but Proof please.)
>
> Grant
> At 12:35 PM 8/25/00 -0500, Todd Young wrote:
> >I beg to differ on this point. If the new wheel is wider than the old, you
> >would want to increase the offset by exactly half of the difference in width
> >between old and new. That way you would maintain the steering center.
> >
> >Grant Lenahan wrote:
> >
> > > At 09:59 AM 8/25/00 -0700, ACAdelhoch wrote:
> > > >I am ready to purchase 8x17 wheels for my Audi, but am not 100% certain of
> > > >the offset needed. I think the factory offset for the 7x15 speedlines are
> > > >37mm, but should I change the offset if I go with larger wheel width?
> > >
> > > For most neutral handling, you want to maintain the *smae* offset, since
> > > that keeps the steering center where it was intended to be.
> > >
> > > The fly in this logic is that some cars need to set the wheel further out
> > > to avoid rubbing a suspension component, but you didn't specify the car, so
> > > no one knows (except those who have your stable memorized :-))
> > >
> > > >Please let me know what the correct offset should be on an 8x17 wheel.
> > >
> > > See above.
> > >
> > > >I am going with 215/45 r17 tires if using 8x17 wheels. Does this sound
> > > >right? I used the aspect calculator and found this tire size to give the
> > > >closest match to PLUS 2 upgrade.
> > >
> > > geometry solves this one.
> > > effective radius = wheel Radius + sidewall height
> > > sidewall height = width * aspect ratio
> > > circumference = 2*pi*r
> > >
> > > Grant
> > > ==========================================
> > > Grant Lenahan
> > > glenahan at telcordia.com
> > > gfl at erols.com
> > > gfl at alum.MIT.edu
> > >
> > > _______________________________________________
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> > > please visit the web interface at
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> >
> >--
> >-----------------------------------------------------------
> >Life's a beach. Dig your toes into the sand and enjoy.
> >-----------------------------------------------------------
> >Todd Young              WAM!NET Inc.
> >tyoung at wamnet.com       655 Lone Oak Drive, Bldg#A
> >651-256-5051            Eagan, MN 55121
> >800-585-1133 ext.5051   http://www.wamnet.com/
> >'93 Audi 90S(|___\====OOOO====/___|)
>
> ==========================================
> Grant Lenahan
> glenahan at telcordia.com
> gfl at erols.com
> gfl at alum.MIT.edu
>
> _______________________________________________
> Quattro mailing list    Quattro at audifans.com
> To remove yourself, change to digest mode, or temporarily stop delivery
> please visit the web interface at
> http://www.audifans.com/mailman/listinfo/quattro

--
-----------------------------------------------------------
Life's a beach. Dig your toes into the sand and enjoy.
-----------------------------------------------------------
Todd Young              WAM!NET Inc.
tyoung at wamnet.com       655 Lone Oak Drive, Bldg#A
651-256-5051            Eagan, MN 55121
800-585-1133 ext.5051   http://www.wamnet.com/
'93 Audi 90S(|___\====OOOO====/___|)