What is speedo error from tire change?

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Old 09-28-2008, 03:52 PM
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What is speedo error from tire change?

Just put on a set of BFG Mud Terrain 285 75 16 on my 98 150 4X4 extended cab. I believe original equipment was 245'S and would like to know the percentage of speedometer error so I can calculate gas mileage. Really like the tire. Much quieter that I would have thought. Thanks Ron
 
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Old 09-28-2008, 04:00 PM
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Here you go, just enter your sizes.

http://www.discounttire.com/dtcs/infoTireMath.dos
 
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Old 09-29-2008, 07:34 PM
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Old OD/New OD x any given MPH = how fast you are really going.
 



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