wondering about my odometer

[The exploder]

So when i went up a tire size to 30 9.50 s i know that my speedometer is off by a few butt what is my odometer off by...Thanks
James

 

[Burns]

Oh its not off by much. I would say at the most you are going two or three mph faster.

 

[MrShorty]

Between 235/75R15 and 31x10.5R15, my odometer changes by ~5.5%.

Here's a simple way to check. Go for a little drive down I-15 (you may want an assistant). At milepost x, note the odometer reading. Drive ten miles to milepost 10+x and note the odometer reading again. From what I've seen, those mileposts are pretty accurate, so this should give you a good feel for the error in your odometer.