Are 285/75s 33inch tires? idk standard tire size.

 

http://www.google.com/#sclient=psy&h...w=1680&bih=967

 

285/75/16 is a 33x11.5-16

 

285s are actually 32 cause i just bought 305/70/r16 mickeys and there 33inch tires

 

here you go, this one has metric sizes and inches (to the right - under additional sizes)
http://www.1010tires.com/tiresizecalculator.asp

 

plug you numbers in here, 305/70's are 33x12.5, 285/75 are 33x11.2

http://www.dakota-truck.net/TIRECALC/tirecalc.html

 

here is a walk through if I typed up for someone a couple weeks ago
How you figure out a metric tire (I will use 285/75 16)
285 means 285mm wide.
75 means the sidewall it 75% of 285mm.
16 obviously means the rim diameter.
For the rest of the example I will use round numbers.
again I will use a 285/75 16 tire.
285mm to inches is about 11
75% of 285mm is 213mm
213mm to inches is about 8"
to find the tire height you do sidewall (8") x 2 + rim size (16")
(8x2)+16 = 32 I rounded down through the whole thing but it ends up to be 32.8" high.
Hope this helps and makes sense.