Im running 285/75/16 on my 1500 without lift and with the factoy chrome wheels. These are Big O tires. The manufacturers specs say installed hieght on an 8 inch rim is 33.3 inches with new tread, they have about 9.5 inches of tread with about 10 .5 inches crossection. Ive been on some 3.0 trails and havent hit anything YET, but i go pretty slow, cuz my shocks suck for now. Hope that helps.