With a rear wheel size of 19x11 and a 305/30/19 tire what is the best set up for the front?? My front wheel choices are either 19x9 or 19x10's...with the 9's a tire size of 235 or 245 would work. The 10's a tire size of ~ 275 would work... Input on the pro/con, fitment...
[an 08 Porsche GT3 runs 305/30/19R & 235/35/19F is this the best??]

 

19x10 with a 275/30/19

 

can u give me a little more input as to "the why of it" why are 10's on front better than the 9's? THX

 

If you run too narrow of a front tire compared to the rear, the car will have significant understeer. Porsches get away with the large width stagger because they are rear engined and designed around that stagger. Our cars are designed with a small width stagger, so keeping that to a minimum will keep handling similar