My wife and I had our Raleigh Companion out for our first longish ride today...23 miles. At about 20 miles, we had a blowout on the rear wheel...we have about 100 miles on the bike so far. I found a 1/8" slit on the tube with two parallel lines that didn't cut through. We changed the tube and made it a 1/2 mile or so and the new tube blew out.
We walked the last two miles, with a stop at Taco Bell and a little park to eat the burritos
Inspecting the tire (a Kenda 26" K-shield), I couldn't find anything puncturing through it, but the cord was showing through the rubber near the bead about 1/2 way around on one side and the tire looked a little wiggly when we put the new tube in and inflated it.
The first tube was inflated to the max. 65 lbs...we inflated the spare tube to 45 lbs. just to go easy on the tire that looked like it was failing (and did!).
To what degree is this kind of failure a tandem problem? Our combined weight is about 360 lbs, which shouldn't be a huge load. All our riding has been on roads or bike paths. Did we just get a dud tire?