http://www.nittotire.com/
go to the link above. then go to the tire page.go to the terra grappler page and go to sizes and specs.they list all the tire diameters. the 285/60/18 are 31.38 inches. and are 11.54 inches wide.
kuba, i have 265/75/16 terra grapplers. there is a minor amount of trimming to fit. as you can see in the pic. shawn
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