Can it be done? Yes. Safe? That all depends on how hard you like to take your corners. And really, it is very much contingent on the brand of tire you are purchasing. Example - a 275 nitto is at least an inch narrower than a BFG 275 tire, so a 275 nitto will fit much better on an 8" rim than its BFG counterpart. I have about as much bulge w/ my 255 BFG KDW tires on an 8" wheel as fluffyrunnells has w/ 275s on his wheels.