How Launch X431 Diagnostic Tool Program Custom Tire Sizes?

Here is an unique feature that Launch X431 Diagnostic Tools have while others like Autel and Snap-on don't.
Launch X431 allows users to Program Custom Tire Sizes.
program custom tire size

Path on Launch CRP919E BT:
Special Function>>Program Tired Size
special function
program tire size
tire size
If we change the circumference, here we got a list of factory tires that could have came on the truck.
We could select exact tire size if we know.
If not, we could simply select "If Can Not Find Tire Size You Need, Click Here".
custom tire size
Here we enter circumference in millimeter, so it will display correct mile per hour.
To get info, we can go to discount tires website to get the calculator there.

Done! Have a try!