i would say 295-70-18 which is a 34"
or have seen some guys on here running 35's
alot depends on the wheels backspacing and offset!
2008 ram 1500 bighorn 4x4
2 1/2 level lift--hella 500ff grill lights--17x9 centerline grizzly-305-70-17 nitto terra grapplers--front air valance removed--tinted windows--custom audio system clarion vz401 head unit--pioneer 4channel amp and class D mono amp--memphis mclass door speakers--clarion dash speakers--kicker subs