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According to my odometer, I have driven 53,000 miles since I switched from the 265/75/16 Goodyear RT/S to 285/75/16 BFG AT. My speedo was never corrected. How many miles are really on my truck?
 

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Take the perimeter of your wheel PI*Diameter. Take the perimeter of your old wheel PI*Diameter. Find the ratio or percentage of perimeter that you increased and use it as a multiplier.
 

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Your speedometer and odometer are off by 4% so 53,000 x 1.04 = 55,120 miles that are really on the truck. you went from a 31.6" tire (265's) to a 32.8" tire with the (285's)
 
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