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Kevlar is a tough DuPont fabric. Beads are what's on the edges of bicycle tires and clings to the rim and keeps the tire on when it's inflated. Kevlar is used for the beads of most high quality bicycle tires (instead of wire) to save weight, improve ride quality and make it easy to fold the tires for portability. Tires with Kevlar beads are called "folding" tires.