Old 01-19-21 | 09:56 AM
  #164  
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cyccommute
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Joined: Nov 2004
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From: Denver, CO

Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones

Originally Posted by cbrstar
Well fast forward to about 1min and you can see simular situation of what happened to me.
Many of the new bmx tires dont have the metal wire in the bead anymore. Maybe if it had the damage wouldn't been as bad?
If you look closely while he is pumping up the tire, you can see the tube has herniated out of the tire. It looks to me like a section about 6” long at the bottom of the wheel. It’s very obvious that the tire hadn’t been seated on the rim properly. Perhaps if he had been paying attention to what he was doing rather than fiddling with a phone, he would have spotted the tube coming out.

Folding tires are very common and they use a Kevlar bead. I have never seen a folding tire have bead damage because of the nature of the flexible bead. Tires that are rigid and hold their round shape are wire bead. The bike in the video has a wire bead.

I will say that a folding tire...or any tire...can be damaged around the bead if you use the wrong tools to install or remove the tire. If you use a knife or screwdriver to do tire removal or installation, you can damage the sidewall. The tire casing is just a fabric that has been impregnated with rubber and, if damaged, it will act like fabric. In other words, it can tear.

The bottom line however, is that the video above is user error and not the fault of the tire or tube. A patched tube would respond just like an unpatched tube. If the tire were installed correctly, there would have been no blow out.

[/QUOTE]If the tire wasn't seated right then it would have come off the rim much sooner. And I agree that a tube is sealed in the tire making it last longer. But again I think its where you live. Being in Canada we get extreme temperatures from super cold to super hot. And I really believe it's all in how it's stored over the winter.[/QUOTE]

How long it takes for a tire to slip off if it is installed incorrectly depends on a number of factors. I’ve had tires blow off when after 15 minutes...scared all of my co-workers... as well as others than have blown out in seconds. I’ve had some tires that don’t seat well...mostly 20 inch wheels from HelMart...where I can see the tube sneaking out and I’ve been able to deflate the tire before a blowout. The rubber of a tire is a fairly high friction material so it can take a while for enough of the bead to unseat prior to the blowout.

As to temperatures, my tubes are stored in my garage. The temperature fluctuates widely as well. That really has little effect on the rubber. You’d have to get to much higher temperatures than even the warmest summer day to have much effect on the rubber. Cold temperatures have zero effect on the rubber and would even prolong the life of the tube. You can damage a tube by taking it out of the box and leaving it sitting around or leaving it in direct sunlight for a very long time (years). Store them in a closed container and in a dark area and they will last for a very long time.
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