Senior Member
Join Date: Jul 2005
Location: New Haven, CT area
Posts: 1,415
Bikes: Trek 7.5 Hybrid, Trek 1.1 Road, Holdsworth touring,Raleigh International,Ritchey Commando,Italvega Speciallissimo,et.al.
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It is probably just the bead not sitting into the rim correctly. Sometimes the tube can get caught in between the tire and the rim, causing a bulge. However, there is a very small chance that the tire itself is bad. On a very rare occasion, even in a bundle of 50 brand new tires, we would get a new tire that had a wobble in the tread that was from the manufacturing process and had to be returned.