Do Lower Profile Tires affect Speedometer Reading

[David]

> 
> From: Huw Powell <audi at humanspeakers.com>
> Date: 2005/11/10 Thu AM 12:13:57 EST
> To: Mark R <speedracer.mark at gmail.com>
> CC: quattro at audifans.com
> Subject: Re: Do Lower Profile Tires affect Speedometer Reading
> 
> 
> >  Yes, a narrower (width) tire has a smaller contact patch at the same
> > internal air pressure and weight. Of course, this presumes the same or
> > similar tire carcass characteristics.
> 
> At the same inflation pressure and weight, any tire will have the same 
> area on the road.
> 
> -- 
> Huw Powell
> 
> http://www.humanspeakers.com/audi
> 
> http://www.humanthoughts.org/
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> 

Exactly. At the same pressure & weight, all a wider tire does is make the contact patch wider and shorter (bigger die-to-side, shorter front-to-back).

Dave
1987 CGT 2.3
SE VA