I know that a lot of us are running bigger/smaller tires then stock on our trucks, often times with out re-caling the speedometer to show the difference correcting. well here is an online tool that i found to help out. I tested it over the last several days and it is very accurate, even had a state cop radar me to verify it. itll give you the corrected speed, no this does not tune your truck, just your mind.

Tire size calculator

try it out.

 

We already have various calculators on the site. Check it out:

https://www.dieselbombers.com/calculators.php

 

oh cool, i was just bored surfing the internet when i found this one, so i thought id post it up.

 

The more info - the better...