Join Date: Jul 2008
Location: Saint Louis, Missouri
Bikes: '09 Rodriguez Adventurer Custom, '08 Trek 7.3Fx
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Either the tube was pinched between the tire and rim, the tire wasn't set in the rim correctly and slipped off (or the tire is too big for the rim from a manufacturer defect,) or the tire had was overloaded and forced itself off the rim.
Tubes only explode when they're no longer confined by the tire in some form, otherwise they make a whooshing sound.