They won't out back with those rims....but a 285-315 would. I see you don't have the room for it with the coil over set up now though. Knew there had to be at least one draw back to them.
When I wear the 275's out on my 17x10's, I plan on replacing them with 315's. It'll be close, but a set of 1/4 wheel spacer will probably do the trick. My car isnt' as low as yours though...but man, I just can't wrap my head around 245's on a 10" wheel.![]()
I have a 245 on a 10.5" wheel. The clearance is fine. Even with the coilovers I have plenty of clearance for more tire. I put the 245 on there because I like how it looks, not for clearance. I have a 1/2" spacer on it now but here is how it looked with no spacers at all.

