Being a world class sprinter, I need a chain that can transfer all that power to the wheels without snapping in two. I had tried other materials...diamonds, Adamantium, vibranium, but they all broke too easily. Good thing I was anle to find these Shimano Ultegra chains. The tiny elves who make these chains use special incantations to magically bond the links, so that even the Hulk isn’t able to break them. Buy one, they’re better than using your belt.