Josiah: The issue is "slip angle", the higher the tire pressure, the stiffer the body of the tire gets, the less slip angle is generated. More slip angle in the front than the back understeer, more slip angle in the rear oversteer. Pick up Carol Smith "Tune to Win", to get a clearer picture. Rick Glesner Littleton, Colorado '91 90q20v '82 911 SC '83 Rx-7 SCCA Spec Racer #27