Are these the same as 31x10.5x15? I'm looking for some new tires that will give me some lift, and I could get a nice deal on some that are 265/75/15. Any comments?

30.6" in diameter... rounded off to a 31"
10.4" in width .... rounded to a 10.5"

yup, they are as close metrically as you can get to a 31x10.5x15

They are as Jim says and usually cheaper. I'd say go for it!