yep 305/70r16 are 33" tires (roughly) so are 285/75R16. 285's are a little skinnier and a tiny bit taller. 305s are 10mm wider, and just a bit shorter.
reading metric tires are easy, the first # is the width of the tire in Millimeters, the 2nd # is the percent of the first # measuring the side wall so:
285 is the width and 75% is 213.75. thats the length of the side wall on one side, so multiply by 2 = 427.5 then convert to inches (cuz most of us are in america!!) = 17.1 then add the diameter of the rim (16) =33.1
ok 305 x 70%= 213.5 x2 = 427 converted to inches = 17.08 add the rim =33.08
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