Well, it happened again, another Conti sidewall failure. I noticed a small bulge on the side of the Ultra Gatorskin after 4,523 km. There's a cut in the sidewall and the tube is just starting to press its way out. Fortunately I spotted this in time, especially since it's on the front wheel of the tandem. The tire has been in use since late 2008 and regularly pumped to 120 lbs. It is a 700x23, 230 gram clincher, and team weight is 320 lbs. It was replaced with what I think is the best 23mm performance tire you can get today, the 220-gram Vredestein Fortezza TriComp.
Anyway, every Conti I've ever owned that hasn't died of a cut tread has died of a sidewall failure (sometimes catastrophically!). I had heard lots of good things about the Gatorskin on this board so I thought I would give it a try. I must say I am quite disappointed, it's just like any other tire Conti makes; they still haven't gotten the sidewalls right, and I'm even a big fan of German products. So much for Conti. Here's the photo: