Remember that the sidewall number is the ratio of the width, not an actual length value.. so its basically 30/100 times the 285 mm.. It's still a little shorter.. Overall the diameter is still stock.

I can't see the photos at work unfortunately. But the 285/30/19 should be filling the wheel wells the same as a stock sized tire, or a 275/40/17.. or 315/35/17.. etc

 

Yeah, I know what all the numbers mean, and how figure overall height, width, and sidewall height of tires.

285 x .3 = 85.5mm
245 x .4 = 98mm

98 - 85.5 = 12.5mm = .49"

BTW, 285 x .35 = 99.75mm

 

my tires are 245 40 zr18 and 285 35 zr18. ill get pics of the ride height up later today

 

I think the car sits real nice as is.
I'd personally raise the rear a tiny bit before I'd drop the front more. A little more travel in the rear really helps the ride quality.

BTW, I ran the GC set with 550 fronts for several years. It's a quality setup for sure.