[chevy620]

Lay a board in front of the tire and one behind it at say, 30 psi. Measure the distance between them. Lower air to 22 psi and do it again with boards. THat is change in physical roll out.
Go to the pits and ask some guys if you can measure that same thing on some different tires.

If I was looking for a solid .01 (which I was with Camaro) I would look for 1" to 1.5" wider gap in the boards. I went from tall Moroso to 26.5 M/T and it was about 1.5" at 26 psi. Haven't been red since but then again....I have been late a few times.

I still feel it is best to find a "spot" you like to leave at and you are consistent at, then work on the car to use that "spot".

A lot of guys on here have done this more than me but we are getting better every time out. I just keep running into guys who crush a .006 light and run the number...I know my day is coming, just have to keep working on it.

Good luck in your tire search.

Jok