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BLOWOUT!!! What happened?(6 posts)

BLOWOUT!!! What happened?Lone Gunman
Sep 13, 2001 4:07 PM
Put new tires on my ride this week. Went on the maiden ride yesterday and decided to go again today. About 5 miles into todays ride, the front tire felt wobbly and also like it was hitting the brake pads, similar to a untrue wheel and BLAM!!, tire blowout. I did look down when I felt the wobble and the tire blew seconds later, and carefully disassembled the tire and tube to find out why for the tire blew. A long slit,2", on the inside where the tube contacts the rim strip. Checked the rim, nothing wrong there, checked the tire nothing there. Weakened tube? Could it have not seated correctly during installation and it pinched? Any opinions? I was going uphill at 7mph at the time it blew so no danger to me. And I got to use the CO2 thingie for the first time in a long time.
tire unseated...C-40
Sep 13, 2001 4:19 PM
Not uncommon for a new tire to come unseated from the hooked edge of the rim. The wobble you felt was probably the tube bulging out, just before it blew. I've even found certain models of tire that wouldn't stay seated, no matter how carefully they were installed (some IRC's about 10 years ago. Had to send them back for another brand, which worked fine.
That's rightKerry Irons
Sep 13, 2001 4:50 PM
It's hard to imagine how you could ride two days on a tire and then have it unseat, but it does happen. The bead may have seated unevenly, or a bit of tube may have been caught under the bead. As the bike is ridden, each revolution of the wheel is working the tire out of its seat. The thumping was the tire finally coming off the rim. This may be a problem tire, or it may never happen again. In mounting a tire, it's helpful to put a little air in, and then work all the way around the tire with your hands to insure a proper seating and that there are no tube pinches.
That's what I had doneLone Gunman
Sep 13, 2001 5:48 PM
The tires are Conti GP3000, the stock tires sold with a Lemond on Rolf VC wheels. These were replacement tires. Fairly confident it was "pilot error" that caused the flat, unseating. Time will tell if that is the case or I have a bad tire. Meantime I need to be certain that I have an ample supply of tubes on hand, just in case.
That's what I had donecyclequip
Sep 14, 2001 4:36 AM
Forget about the Conti unseating. The long slit in the tube is the giveaway - typical of a pinch blow - where you caught a section of the tube under the bead wire on assembly. Next time, especially with soft tyres like Conti, put plenty of talcum powder inside the tyre, rinse the tube in talc, too, and assemble with the tube partially inflated.
I agree...rib-eye
Sep 14, 2001 6:12 AM
Same thing happened to me on my mtn bike. I had changed tires and had already put 2 good rides of maybe 40 miles total on them when on the 3rd ride it happened. I had actually stopped and catching my breath when the rear tire/tube let go with the report of a 38cal hand gun. Since I was in a remote part of a nat'l forest is really spooked me for a couple of seconds. The tube had a 12" slit as cleanly cut as if done by a razor blade.