Guys,

I know this was posted many months ago and I can't find it. Could someone point me to where the calculations are regarding changing your OEM tire sizes to different tire sizes relating to speedometer error?

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Dunbarton "The Middle Aged Kid" '99 XLT SC SB 4x2 4.6 auto 3.55 ls The occasional Z-71 Eater! Wedgewood & Denim, SuperChipped, Airaid FIPK, HD electrical and cooling, power seat, Rhino Liner, Extang Classic tonneau cover, Mobil 1. Man, I got it all! (New Jersey)

 

Here is my page for it. Used an excel spreadsheet. Should be self explanitory, but if not email me.
http://members.home.net/mjbobbitt/f150/tirecalc.html