The standard tools are a spoon-shaped hammer to break the bead down, and a couple of pry bars to remove and replace the bead ring. A big slide hammer helps with the bead-loosening chores, too. A heavy chain to wrap around the wheel during inflation, or a cage is an absolute necessity. Before my back went south, I changed split-ring tires on the side of the road as a matter of routine. As long as the parts fit, and there's no serious rust at critical points, these rims are perfectly safe. Never mix and match components. Once parts have established a running fit, they need to stay together. However, "Nothing is foolproof, to a sufficiently persistent fool!" I've seen enough accidents, and near-misses, to have a very healthy respect for multi-piece rims!
Jerry
