19x9 paired with 275/30 is not good, they'll 1000% rub plus profile 30 is really thin, you wont survive pot holes
my suggestion is to get a pair of 225/35 or 235/35 for the rear
also if i may suggest, try avoiding rims like jestalts, try getting something more subtle, even if you still want chrome rims there are heapsssss of nicer chrome wheels than jestalts, just try browsing around

