Join Date: Mar 2006
Location: In a cardboard box by Alki beach.
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Most likely it is a problem with the tire's manufacturing tolerances, but there are a couple things to look at before trying a different brand of tire from a different shop.
Before mounting the tire make sure the rim tape or strip is centered in the rim and not riding up the side of the rim. If it is off center it could be keeping the tire bead from fully seating.
When you put the tube under the tire, put in just enough air for the tube to take shape. This will help keep a fold in the tube from lodging under the edge of the bead and keeping the bead from seating.
When you pump up the tire, start out with about 30 psi., maybe even a bit less. Take the wheel and go around both sides of the tire rolling the tire away from you a bit and checking the bead to make sure it is sitting evenly in the groove on the rim and making sure that there is nothing like the rim strip or the tube keeping the tire from sitting in the groove. Also if the bead is sitting too low in the rim on one side it will be sitting too high on the other side and can blow out.
Having said all this, my guess is that the tire is just poorly manufactured and is slightly too large in diameter to sit properly in the rim groove. There are still good quality 27" tire to be had but most LBSs don't stock more than one or two choices.