31's and a 2'' bb didnt rub on my jeep at full stuff close but it didnt.
Right now I run 33X10.50-15 Boggers on 15X8 wheels with 3.75'' of bs a 2'' REBB and 1.25'' JKS BL and the tires just tag the outside of the flare in the front (part that hangs down) With a wider flare the tires wouldnt rub at all. (because it would move that lip out farther.
Dont think I have a pic of the heep with the 2'' BB and 1.25'' BL but heres a couple with just the 2'' REBB and 31X10.50's on the stock 15X7 wheels
2'' REBB and 1.25'' JKSBL with 33X10.50-15 Boggers
Same lift with 35X12.50R15 MT's on 15X10 wheels with 4'' BS