starting sizes will be 245/35/19 front, 275/35/19 rear
you'll find people running anywhere up to 275/30/19 front, and 305/30/19 rear
my own car, 19x9, 19x10, I run 265/30/19 front, 285/30/19 rear
remember, the # on the sidewall really is inconsquential, it's about how much tire hits the ground (ie contact patch). Tires are like shirts - not all 275/30/19, for example, will share the same physical dimensions