The first bike of the modern age I bought bore two old skool prophylactics on the tubs: thorn scrapers resting gently on the surfaces of the tire treads. Because it is the second and subsequent rotation of the tire that is mostly responsive for driving the point of the glass or goathead in, flicking them off stops most punctures from developing. They used to mount to the fork brake bolts. I see a patent illustration in which they are mounted with adhesive to the frame.
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