Wheel size suggestions needed ASAP for my 1990 AudiQuattro Coupe....

[Todd Young]

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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'93 Audi 90S(|___\====OOOO====/___|)