I have a Specialized Sirrus that came with Alexrims AS-1 wheels; there is "ETRTD 622 x 16 6061HT6" on the rim in fine print. The tires that came with the bike are Specialized All Condition Pro, 700x28c, aramid bead, 120TPI w/ Armadillo Elite; recommended pressure for these are 75 - 100 psi and I have always kept them around 100. I have about 800 miles on those tires now with no flats or other problems.
As I am commuting in the dark with this bike, I decided to switch to the Armadillo tires with a reflector band on the sidewall. I purchased and installed a pair of the Armadillo elite 700x25c tires, which have a recommended pressure range of 115 - 125 psi.
The problem: I have now blown out 5 inner tubes trying to use these tires. I also watched the guys at the LBS blow one out. The symptom is always the same: the bead loosens up from the rim, a gap between tire and rim develops, and this exposes enough of the tube to let to a blow out. This is despite taking precautions when installing and inflating the tubes, like repeated inflation/deflation cycles, bead inspections, etc. The only riding I have done on these besides the test rides is a one-way (18 mi) commute to work today, and I came out after work to find one of them blown out.
My question: Is it possible that the tire and tube are not compatible? Has anyone else run in to a problem like this?
Any ideas would be appreciated.