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Jeeperjamie
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This
AzRob
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The problem is if one guy airs up at 39 psi and another likes 31 psi the input numbers will most likely be different.
Use tape measure - input - test - repeat till you get it all right and all matching.
I used a radar detector with GPS that shows speed, and the Waze app.... those both now match with my dash speedometer (dial and digital) at all speeds.
ShadowsPapa
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That isn't going to fly - as has been proven by the fact that a fair number of threads and posts already address this.
AzRob gave one reason - air pressure, weight of the truck, etc. All you can do is enter what you have and adjust from there.
You'll find that same answer in at least a half dozen other posts or threads here.
I didn't have to change a thing when I swap on the Rubicon Falken A/T take-offs I run on my Overland in the bad months. The radar and GPS speeds don't vary when I switch tires - but others say they are different diameter tires. Apparently the rolling diameter isn't that different on MY truck.
Besides, if anyone wants to know a diameter- Google will tell that. Start with that and adjust for YOUR truck.
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