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Tire size and GPS

 
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Old 09-14-2015, 08:21 PM
willtim1234
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Tire size and GPS

Please explain to me how changing tire size affects GPS accuracy. I have a 2013 F350 with Ford navigation/SYNC. I recently bought new tires, went from 275 to 295 ( about an inch difference ). My GPS was way off and at times appeared lost. Someone suggested disconnecting the battery for 20 minutes so the PCM could "relearn". This seems to have fixed the problem. I can put any Garmin in any vehicle and it can give me directions anywhere. Makes no sense.
 
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Old 09-15-2015, 06:51 PM
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Am I the only one that had this problem?
 
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Old 09-15-2015, 07:42 PM
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Tire size and GPS

No several have had the issue. It's something to do with the computer and tire size. You'll find the issue frequently in the f150 section. The Garmin gives directions based on the location of the unit and is not calibrated to the truck like the factory head unit is. Heck in order to swap your head unit in your truck to another factory one the vin has to be programmed otherwise it's nonfunctional
 
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Old 09-16-2015, 05:04 PM
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Thanks, Fish.
 
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Old 09-16-2015, 05:49 PM
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Tire size and GPS

Your welcome
 
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Old 09-18-2015, 08:39 AM
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Since going to larger tires my speedometer is more on with my gps. Almost as if the factory is programmed for 20 inch rims and the 34 inch tires from the factory. I had 275s 18 inch tires now have 35 inch tires on 18
 
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Old 09-20-2015, 06:34 AM
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My 2014 xl is off about 4mph according to my Tom Tom. Maybe I need to put bigger tires on it.
 
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Old 09-20-2015, 12:31 PM
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Tire size and GPS

I think the input a tire size into the computer and not revs per mile or they just use a happy medium that's close enough. Different tire manufactures could have the same size but could differ in overall tire height and width which would cause it to be off.
 
 
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