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Re: Off-diameter tires

In a message dated 95-12-09 22:51:42 EST, you write:

>you have now.  When you change the tire diameter (outer diameter, not 
>inside diameter) it not only changes the speedometer calibration, it 
>also changes the RPM range your engine works in.  A car that turns 
>2000 RPM at 60 MPH might spin at 3000 RPM at 60 MPH with a smaller 
>diameter tire.  

Wow--that's gonna be quite a change in tire diameter.  A car with starting
with a 25" (215/60-15) diameter tire at 2000 rpm for 60 mph would have to run
a tire diameter of 16.7" to spin 3000 rpm at 60.  let's see--that would be
about a 225/10-15.  imagine the sidewall stiffness you'd have!  hey, anyone
got the number for Pirelli?