I recently purchased some rather expensive, supposedly invincible tires for my commute / touring bike. The Schwalbe Marathon Supremes are acclaimed as about the most indestructible tire out there, short of a couple truly massive things that really aren't much fun to ride on.
Now, if you ever found yourself asking, as I have, "Self, just what would it take to puncture one of these tough tires?" I can now provide an answer.
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