Originally Posted by
ThermionicScott
Rather than using levers to pry off the tire, try getting all of the beads into the center well, grasping the tire in one spot, and pulling it laterally until a bead comes over the rim sidewall. That's not a great explanation, and I'd like to make a video or something someday, but it works well for me when dealing with tight or really stiff tires. It's annoying to my "just use a tire lever!" friends, but I nearly always triumph in the end.
I do all of the above: (a) I use a tire lever to
push the bead from
both sides of the tire off the hook into the center channel except at the valve stem where it is impossible to do so, (b) pull the tire at the opposite end of the valve stem, and (c) use a polymer lever to help remove the tire.