Specifications for 215/85/16 and 235/85/16; 215s-section width-8.7" on 6" rim, overall diameter-30.5". 235s-section width-9.2" on 7" rim, overall diameter-31.8". These specs are for D (8 ply) and E (10 ply) load range tires, taken directly from the Michelin Data Book. I don't have weight specs, but neither size weighs more than perhaps 70#s max.
