If you're going to try and fit those on a stock wheel, you will not be able to get the wheel on. Stock wheel offset with a 285 rubs against the UCA, with a 305, you probably can't even get the wheel to sit again the hub. Not to mention, I don't even know if you can safely fit a 305 on a 7.5" rim... my 285/75R17 Nitto Terra Grapplers came with big warning stickers saying the smallest width to put on was 7.5"