[V8] Tire/rim size and Speedometer calibration

[DasWolfen at aol.com]

In a message dated 3/9/04 12:45:55 AM Eastern Standard Time, 
lorberg at adelphia.net writes:

> only acquired mine 4-5 months ago.  The speedometer is metric, of course.  
> The previous owner claims that the car came factory equipped with 205/60-15 
> tire/wheel combos.  I am skeptical of his claim and thought that the 
> tire/wheel combo was 215/60-15 regardless of final destination.  In any case, the car 
> is presently wearing 205/65-15 winter tires and I am curious as to whether or 
> not I should be factoring in a small (or perhaps not so small) adjustment, 
> based on differences in overall wheel diameter, into the speedometer reading 
> to bring it in line with the actual road speed.  I have already earned myself 
> one speeding ticket with this car, and feel that I should arm myself with 
> whatever information is available in order to keep within the legal 
> limit...............at those times when I choose not to exceed the limit.
> 

The difference between a 205/65-15 and a 215/60-15 is a whole .8 mph at 
60mph...thats within the accuracy range of the speedo itself. What you should be 
arming yourself with is a speedo that reads in MPH.