Ahh, Flatty flat flats, the bane of the commuter! I feel your pain. My last flatty flat finally initiated an order for Mr Tuffys. They will arrive sometime next week.

My last flat, earlier this week, was from a shark tooth shaped piece of brown beer bottle glass, Monday or Tuesday night. It was like the Devil's own guitar pick. It pierced the Kevlar belt of a Schwalbe Marathon. I didn't recognize the sound until too late! Grrr.

When my order arrives, I am considering putting a Tuffy on the rear tire only. That's where all my Flatty flats occur.