Up Sizing Lx470's Tires

[clouser]

Hi Everyone,

I'm looking to replace my LX 470's 275 x 60 x 18 OEM size tires with 275 x 65 x 18 or 285 x 65 x 18. I've been reading through most of the postings and found a pined FAQ on wheels and tires which was very useful. It answered one of my question which was the speedometer error going with a larger size tire. The last question is will the bigger size tire fit under the rear bumpber?

Has anyone here replace their spare tire with the sizes I've mentioned? Your help is appreciated.