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Old 07-14-2011, 10:29 AM
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99F150
99F150 is offline
Fleet Mechanic
Join Date: Aug 2002
Location: Sioux Falls SD
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I put larger tires on My 99 last December 2010 and went to 225/[B]75[B]/15.
made my road speed per GPS 2 MPH faster to 62 VS 60 on speedometer. Also now i only clock 95.5 miles per 100 driven.
Stock tire size on mine was either 215/75/15 or 225/70/15, just that small bump in aspect ratio made a noticable effect.