And here's the whole spreadsheet on this subject plus a whole lot more....
http://lonestar.texas.net/~bernd/Automotive_Calculations.xls
- Bernd
> Ken, this may or may not help you, but there is a nifty
> link on the DML homepage that deals with this.
>
> http://www.dakota-truck.net/TIRECALC/tirecalc.html
>
>
> -Kevin D.
>
>
> >
> > Date: Wed, 25 Oct 2000 15:09:33 -0800
> > From: kenh@photocenterimaging.com (Ken Hoffman)
> > Subject: DML: Gearing VS Tire Dia
> >
> > hey kids,
> > Have any of you changed your rear end ratio to compensate for larger
> > diameter tires? My Dak is a 99 4x2 v8, now w/ a fabtech kit, and I'm
> > changing from 235/75/15 up to 10.5x31s. I'm currently
> > running a 3.55sg
> > and am considering 3.92 (or is it 3.90) to compensate for the larger
> > tires. I would rather spend the money to do it that way
> > than HOPE that
> > the dealer reflashes to computer PROPERLY to ensure accurate
> > speedo and
> > computer signals. I'm ignorant as to the proper mathematical
> > equation to
> > calculate the rpm difference to see wether that ratio change
> > would even be
> > appropriate. (runon sentence:0) -----Sooooooooo, if any of
> > you have done
> > this or could help me out on the calculation, it I would sure
> > appreciate
> > it!
> >
> > thanks,
> > ken H
> > Simi Valley, CA
> >
> > "The shortest distance between two points is a straight line"
> >
> >
>
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