Originally Posted by
Snikerdoodlz
I know that it's a problem with the rim itself since I've put my exact same tires on another rim with much less effort..
To be clear, the problem is
this tire with
this rim. And assuming that they're compatible at all, the answer is to stretch the tire. Lots of good ways to do this but what I do is (with no tube installed) get the tire on as far as you can and work the tire lever around the remaining bead and lock it onto a spoke and let it sit for a while, then move the unseated bit around and repeat. Once you can get the whole tire on without a tube inside, then take it off, install the tube, reinstall the tire and don't use a lever.