First off, you are talking about an X and they sit a little lower.
You are going to get answers all over the place.
My R sits at 14" with 30's as set by Weller Racing.
ST says 13 Front, 12.5 Rear with stock tires so with ~31.4" tires that would be 14.7 and 14.2 respectively.
I would call GForce and ask them what a stock tire setup is supposed to be set at and add 1.7"
You are going to get answers all over the place.
My R sits at 14" with 30's as set by Weller Racing.
ST says 13 Front, 12.5 Rear with stock tires so with ~31.4" tires that would be 14.7 and 14.2 respectively.
I would call GForce and ask them what a stock tire setup is supposed to be set at and add 1.7"