Originally Posted by Lemans_Blue_M
The section width of the actual 275/19 tire is not that much wider than the 265/19 tire. Both will offer you a little curb protection for the lip of the wheel. Going any larger is simply adding unnecessary weight that will negatively impact performance.
Depends. If you are only worried about drag type take offs go the widest you can at the rear. If you are worried about handling, the understeer/oversteer tendency then you should scale the OEM sizes roughly in proportion in width.