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tire size

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farminstud18
 Post subject: tire size
 Post Posted: Sun Jan 29, 2012 5:58 pm 
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Joined: Sat May 22, 2010 4:14 pm
Posts: 15
I have the 3865 tuner for my 08 dakota! when i use my gps, i notice that there is a 1-2 mph difference. I have stock tires on my truck. I know i probably have to go up or down in size by a quarter but am not sure which way! Could you guys help me out? THANKS!
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RON @ SUPERCHIPS
 Post subject: Re: tire size
 Post Posted: Tue Jan 31, 2012 9:48 am 
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Joined: Tue Jul 25, 2006 9:41 am
Posts: 18258
Location: SUPERCHIPS
GPS and speedos are off from factory about 3-5%.

Depending on which way the speedo is off will determine which way adjust up or down to get it close.

The only thing that you must be correct on is Radar.

Ron

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