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Commuting Bicycle commuting is easier than you think, before you know it, you'll be hooked. Learn the tips, hints, equipment, safety requirements for safely riding your bike to work.

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Old 02-05-06, 04:10 PM   #1
propagandrew
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Not sure this really applies to commuter forum, but since it happened on the bike I commute on I figured I'd stick it here. Yesterday I came up with yet another flat (had more than my share recently). Went out to get a new tire today since the old one is pretty toast. When I got home I brought the offending bike in the house and sat down to watch a movie. Right as the movie, Underworld, is ending there is an obscene amount of gun fighting. In the room next to me where the bike is I hear a LOUD bang, loud enough I could feel the shock in my chest. I go in there and the rear tire, which was working fine, is blown over the rim on one side. I took the tube out and there was a nice 3 in long hole in it.

Apparently pumping a tire to 95psi at 10 degrees F then bringing it inside to a 70F house *can* blow the tube. Never had that one happen before and surely did scare the hell out of me.

Picture of tube:
http://home.mn.rr.com/andrewh/tubepop.jpg
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Old 02-05-06, 04:36 PM   #2
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No, it can't blow the tube. Seriously. There was something else wrong with it. The difference in tire pressure could not have been more than 5 PSI or so. This is a common, pervasive cycling myth, though. It just won't go away!
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Old 02-05-06, 04:45 PM   #3
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Quote:
Originally Posted by grolby
No, it can't blow the tube. Seriously. There was something else wrong with it. The difference in tire pressure could not have been more than 5 PSI or so. This is a common, pervasive cycling myth, though. It just won't go away!
I've had it happen to me on a very cold day when I stopped into a warm LBS. After about a half an hour my tube exploded. The wrench I was talking to and I just looked at each other and shrugged.
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Old 02-05-06, 05:27 PM   #4
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You pinched the tube between the tire and the rim.
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Old 02-05-06, 05:52 PM   #5
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The tube that I had been riding on for the last week, which was fully inflated when I carried it into the house, just decided to fail? I don't think I pinched the tube between the rim upon setting it inside of my trainer.

Myth or not I just had a completely functional tire blow completely overtop the rim after bringing it inside my house.
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Old 02-05-06, 06:53 PM   #6
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Pinched tubes do that. They don't alway blow immediately.
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Old 02-05-06, 07:16 PM   #7
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Quote:
Originally Posted by supcom
Pinched tubes do that. They don't alway blow immediately.
+1 It's typical and fairly common.
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Old 02-05-06, 08:34 PM   #8
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Yeah. Sometimes I ride into work on hard tires, then come out of work and one is flat. Or wake up in the morning and find a flat.
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Old 02-05-06, 10:33 PM   #9
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it had been sitting for 2 days without being ridden. apparently the extra 5psi from bringing it inside was sufficient to make the supposedly already pinched tube pop.
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Old 02-05-06, 11:50 PM   #10
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Compliments on your choice of subject line. It's informative and amusing. I knew pretty much what your post was about and I'm much more likely to read a post if I have a better clue than subjects such as "what do you think?" or "so disappoining"

I don't know enough about the science involved to have an opinion here. Your assessment seems plausible to me but so do the others who say otherwise. The only time I had a tube go bang was when the gauge malfunctioned and I grossly overinflated a tire. It blew about two hours later, just a few minutes after I dismounted.
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Old 02-05-06, 11:59 PM   #11
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I very much agree with the science, pv=nrt is no grand mystery. Just saying that in this particular case the 5psi difference was enough to make for a very loud and spectacular surprise.
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Old 02-06-06, 12:18 AM   #12
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well....in the name of science...i shall conduct a grand experiment.
ive got an old 24" inch rim, tire and tube sitting in my room, all completely funtional, just with nothing to put it one....so im gonna take it out tomorow morning when its nice and icey, fill it up and place it in my room...ive also got a pressure gauge in my garage, so ill bring back some scientific readings. wish me luck, and heres to going where no man has dared go before....

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Old 02-06-06, 12:21 AM   #13
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I think it would be better if you put it out tonight, then inflated it tomorrow. It more closely duplicates the conditions originally described.
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Old 02-06-06, 01:29 AM   #14
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Quote:
Originally Posted by supcom
Pinched tubes do that. They don't alway blow immediately.
I had been riding on mine for over two months, everyday, over cobblestones with loaded panniers when it blew. It was the rear tire. Pinch flat? I don't think so....
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Old 02-06-06, 07:03 AM   #15
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Quote:
Originally Posted by supcom
You pinched the tube between the tire and the rim.
x2 ... btdt
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Old 02-06-06, 08:50 AM   #16
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Or your rim strip slipped and a spoke hole ate the tube.
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Old 02-06-06, 09:37 AM   #17
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Or your rim strip slipped and a spoke hole ate the tube.
that happened to my mountain bike. i hadnt ridden it cause i was waiting for new brake pads, and one day it was flat, and the culprit was a spoke.

well, my evil experiment has been put on hold. my balloon/duct tape job on my bike pump failed, as i thought it would one of these days, so im waiting for my new one to show up. should be soon. Ill put the wheel outside tonight and go from there. I might just go pick up a crappy tire pump today as a quick fix. Ill figure something.

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Old 02-06-06, 10:26 AM   #18
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Happened to me last winter. My commuter stays locked outside. I inflated one 700 X 23 tire to 110-120 psi before leaving for work. The outside temp. was about 5 deg. F. At work I put the bike in my cubicle and it blew off the rim about 2-3 hours later. Now I keep the pressure slightly lower if I inflate the tire when the bikes that cold.
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Old 02-07-06, 11:52 AM   #19
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Quote:
Originally Posted by grolby
No, it can't blow the tube. Seriously. There was something else wrong with it. The difference in tire pressure could not have been more than 5 PSI or so. This is a common, pervasive cycling myth, though. It just won't go away!
I did some numbers and Im'a have to go ahead and disagree with you there.
70 degree Fahrenheit = 529.67 degree Rankine
10 degree Fahrenheit = 469.67 degree Rankine
529.67/469.67 = 1.1277
1.1277 * 95psi = 107.1315
107.1315-95 = 12.1315 psi difference
(assumes air is an ideal gas, assumes constant volume of the tube, bla bla...)

Combining the fact that I wrongly read the max pressure (tire actually says 90, not 95) and the fact that I rode 75 miles or so with that tire on, I think I'm going to argue that the $8.99 walmart tire did infact decide 107psi was too much.
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Old 02-07-06, 12:52 PM   #20
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It happened to me twice. First time, it was with my tubeless MTB tire. Pumped it up for a mountain bike ride (60 psi), then loaded it on the hitch rack. The outside temp has risen to over a hundred. About 5 miles from home I hear this loud bang from my vehicle's rear. It was my mtb tire.

Second time was when I was cleaning the road bike's tire/wheel in the laundry sink. I didn't realize I only had the hot water on. You guessed it. Another loud bang.

In both instances, the wheels went out-of-true.
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