Squish factor regarding tires size?

[hampsterzone]

My remodel'd Edge a.k.a Gryphon will be here soon. I have 35" tires and I will be accounting for them in my tunes. I believe Bill is writing my tire size into my tunes. But just in case when I use custom options to report my 4.56 gears, I would like to have the correct size for tires. It would be nice to have had everything written in prior to Bill writing my custom tunes. But no bigger! A little help with tire size would be awesome.