I am using the stock rims on my 07 NBS Z71 1500 with some new tires. I have been looking at the Toyo MT's but I think there may be a problem. They come in 33X12.50R18's but on one site it said you needed an 8.5-11 in wide rim to run them. My problem is, my rims are only 8"ers. Is there anyway I could run these or do I need to keep searching for a tire that is a 33X11.50? Also, what is the size equivilent (in metrics) to a 33X11.50 or 33X12.50 tire on an 18inch rim?

Thanks a ton guys