Another how to change tire size question. Sorry

[blakern]

I have a 99 escalade that im trying to change tire size on. I have the "Error" in the current tire size value, so it wont allow me to enter the new tire size in. I tried using the spreadsheet in the sticky but I wasn't able to make sense of it. Im going from 265/70/16 to 265/75/16 or basically 30.6" to 31.6" If someone could help me manually scale this I would be very thankful.

99escalade5.7vortecshiftfirm.hpt

[blakern]

my bad I posted this in the wrong section.