Originally Posted by
KBentley57
Put on a pair of gloves and roll the last part of the tire up and over the rim with your palms. Don't baby it, and don't use tire levers. It'll go eventually.
+1. Once you have one side of the tire around the whole rim there are no issues with it taking the shape of the rim. If the last part is really tough to roll over, just keep massaging it from the two sides and eventually it will pop over.