235/35/19 - front
275/30/19 - rear
This is a great setup and there is nothing wrong running staggered in an AWD, like everyone else said just make sure the rolling diameter is less the 1% difference. Though running the same size tire at all four corners will get you around the track faster and you have the convenience to rotate them
The AWD system in the XI is rwd bias, meaning you mainly run in rwd and the front doesn't start gripping until the rear slips.