Oh. I rode these on our tandem 3 years ago and LOVED the ride at first, but after about 300 miles threw them out, Could not keep air in them. Nice ride but just not durable enough. We now ride Vittoria Hypers and love them but they are a little more expensive than Panaracers. Try Conti Gatorskins for a good all around tire at a reasonable price. If you have some extra cash get the Hypers...
Here is an older post similar discussion with a member poll of favorite tires... Good info!
http://www.bikeforums.net/showthread...=#post13393260