I have 31's on my YJ. I have had this set for I don't know how many years and miles. I just know a lot. They are holding up great. Like most everyone else has said, great traction, great road wear, road noise is not bad once they get broke in, and they look good. I would recommend them. Once these wear out I will be replacing them with another set.
'93 YJ 4.0L, AX-15, NP-231HD/SYE, 8.8in rear, OME 2.5 lift, home made front hub conversion, hydroboost. Warn M10000 winch. Currently building a stroker.
'79 Cherokee Chief, 401 MPFI fuel injection, T-18/D-20 and hydroboost. Otherwise stock.