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did the heat explode my tire?!

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did the heat explode my tire?!

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Old 07-05-12, 07:29 PM
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arimajol 
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did the heat explode my tire?!

I commuted to work today and left my bike parked outside. The high was 100 and the bike was in the sun for most of the day. When I came out at 5:00, the front tire had exploded! There was a gash of at least 10 inches! Did my aluminum rims get so hot they popped the tube? Did the air inside the tube expand in the heat? Any idea what happened?
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Old 07-05-12, 07:36 PM
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No
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Old 07-05-12, 07:41 PM
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then what would cause a long gash on the inside of the rim side of the tube?
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Old 07-05-12, 07:46 PM
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Tube was pinched by the tire bead.

Front tire blow out for me.
Had been riding 4 days on the tire and tube.

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Old 07-05-12, 07:53 PM
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a hot rim is a better story....but that makes a lot more sense
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Old 07-05-12, 08:08 PM
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vandal with a knife? Happened to me in college.
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Old 07-05-12, 08:32 PM
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When I raced triathlon people would max out the psi in there tires. Once the weather would start warming up you could hear tires popping while the bikes were racked in transition. So I think if you had max psi in your tire the heat could've popped them
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Old 07-06-12, 12:51 AM
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Same thing happened to me once (actually, it exploded while I was inside the county courthouse with my fiancee, getting our marriage license. Bad omen?). I had pumped the tire up to maximum pressure in a cool basement, and then ridden it downtown on a blazing summer day. If your tube had a weak spot already, it's possible that the heat did it in.
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Old 07-06-12, 05:34 AM
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I had my bike inside of my car at work, and a tire popped due to the heat. But, it's a black car and the temp was in the upper 90s. Must've been waaay above 100 in the truck.

I still leave my bike in the back of the car while I'm at work, but the windows get rolled way down....
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Old 07-06-12, 06:26 AM
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The tire came off the rim? That would explain the gash in the tube. Your tire wasn't seated properly (as 10 wheels said, part of the tube may have been pinched under the bead of the tire), and this allowed the bead to lift up over the rim. The heat may have played a role, softening the tire so it didn't grip the rim as well, or possibly the bead expanded farther in the heat than the rim did, but not necessarily. I've had the same thing happen to me three or four times, and heat was never involved. Only user error (that's me) or tires that didn't fit the rims very well.
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Old 07-06-12, 06:47 AM
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I've noticed that the heat of the day and the sun-baked hot roads don't affect my tire pressure too much. Granted I've never taken a measurement, but I have left my house with a little less air than I like (judging only by feel), thinking that the heat will cause them to expand. However, as I check my tires periodically during the ride I've noticed that they feel about the same; I'm sure the pressure went up some, although I can't detect that increase by simply squeezing the tire, so I'm a little skeptical about the heat bursting a tire. At least not with out some other contributing factors.
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Old 07-06-12, 06:49 AM
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I have seen tires pop off the rim twice. Well, different tires at different times, not the same pop off twice. In both cases I was reasonably certain that the tire was seated well, but it was a high pressure tire on a non-hooked-bead rim. In one case it had been sitting in the sun, and I'm reasonably certain that was a contributor. In the other case I was pumping it up, and my ears are still ringing from that one. (I no longer use those rims.)

Over in the tandem forum they talk about using hub brakes to control speed when coming down mountains because a rim brake can overheat the rim and cause the tire to pop off. Not a pleasant thing at speed downhill on a bike carrying two people.
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Old 07-06-12, 08:11 AM
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I had bought a vintage MTB that still had gumwall "Farmer John" tires. Pumped up the tires & put it on the Thule roof rack for a weekend at the beach a couple months later. That night, after dark when it had cooled down, I loosened the strap on the front wheel when "BANG!"- it exploded like a gun shot, even saw a little flash of light. Side wall blew out. Next day, to the bike shop for the new tires it needed anyway.
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