Postby jules21 » Wed Feb 06, 2013 9:48 pm
i made a discovery on this tonight!
i just fitted a new GP4000s to my new roadie. it is a tight fit on the rim. what happened to me was that the tube got snagged between the rim wall and the tyre bead. as i was in a hurry, i got a tyre lever and levered the tyre over. now with other tyre/rims combos which i've used and which have been a looser fit, this hasn't been a big problem. but in this case, the tight fit meant that the tube remained snagged under the tyre bead, even after the bead was seated properly in the rim. it is very difficult to un-snag it once it is seated.
now due to a combination of being late and stupidity, i inflated the tube, hoping that the pressure would pop it back under the tyre bead. i was wrong. about 10 minutes into my ride, the tube exploded - splitting along the section which had been snagged under the tyre bead - and popping the tyre off the rim along the same section.
so there you go - that's one way to blow a tyre off a rim.