tire size/speedometer reading
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New User
Joined: Oct 2009
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tire size/speedometer reading
Several years ago I found a link on here where you could put your stock size tire in & the size you wanted to put on & it would give you a correction factor on your speedometer I have lost this link & would love to have it back can someone in Ford Land help me please
Logistics Pro
Joined: Jul 2006
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From: Detroit
http://www.discounttiredirect.com/di...foTireMath.jsp
It would be a bit more accurate if you looked up the specs on your actual tires (including brand and design) and calculated the percentage difference. Tires are not always sized exactly to the numeric size.
Good luck,
George
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Joined: Jul 2005
Posts: 11,931
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gear ratios did not change. road did not change, pie (3.14) did not change. the speed difference is the ratios of the diameters of the tires. If old tire is 33 inches and new is 34 inches, you changed 1/33 or 3%. Thats 3 MPH in 100. When speedo says 100, you are really going 103 MPH.
