Originally Posted by Mr. Beanz

I bought a set for our tandem. First ride smallest grain of glass caused a flat. The again on the 3rd ride. I took them off then placed one on the rear of my roadie. 2 or 3 flats within 10 rides. Figured it could be the tire so I tried the other GS. Samething! Biggest waste of $70 I ever spent! Put some Specialized Armadillos on the tandem, not one flat....yet!

Some do swear by them, not me!