nothing, tho i couldnt get a clear shot of the tab i could see that the tire never hit/rubbed...im currently running 275/30/20s on 20x11 sp1 with -4 offset at -4.5° camber.
didn't have to relocate them or modify the fenders.
in the first pic, the black rubbed spot was from when i removed the rear bumper (rubbed against my garage wall..) to test fit an on-going project
the second pic shows how far my rim/tire pokes out from the fender (i tried to get a shot where the fender is flattest) (sorry i didn't rotate the 2nd pic, wudda made it lots smaller)
hope that helps.. but if you have further q's, shoot me a pm