I'm wanting to know if the Nitto Terra Grapplers 275/6518 will fit
Did you review and read THIS thread from the beginning? That size is dicsussed, as well as 285/16-18, so you can compare those specs, plus I give a reference to a tire size calculator to help you figure it out, in post #7 and #23, Dub gave a tire size diagram, and I attached a picture showing exactly what may need to be trimmed....
Remember, the search function is your friend....especially with a VERY common question like this.
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They ended up fitting with minor trimming to the front. These are the 275/65R18's
Yokohama 280/60R18 Geolander AT/S on 18x8.0 wheels require a bit of trim on the front. Very minor.
T.
'01 Keiser VX/'85 Defender 110/'97 Disco XD
Try this tire size calculator to compare what you have to alternatives:
http://www.discounttire.com/dtcs/infoTireMath.do