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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 04-30-06, 07:19 PM   #1
hester
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switched to single speed and my tube keeps exploding.

that's correct. i made the switch over to singlespeed and had to tru the wheel over to compensate. i know it wasn't the best truing job done on limited time but it was pretty much straight sidewise. there is a small hop though and i think that may be the problem here...

i made it home that night without incident. the odd thing is, when i went to hop on it the next evening, the tube was shredded. i'm not talking puncture, puncture, hiss - but BANG! shredded. i can't recall being around when it happend and i like to think i would have heard it.

so i changed the flat a couple of days later, started riding and about a quarter of a mile down the road i felt (and heard) the tell-tale signs that something bad was about to happen and whaddaya know? POP! like a gunshot.

i need to know. what's causing this? did i screw the wheel up major?
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Old 04-30-06, 07:21 PM   #2
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This may be a stupid question, but you replaced the rim tape right?
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Old 04-30-06, 07:29 PM   #3
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i didn't really realize i had to. i put cloth tape in when i first got the bike in october of last year... does the truing affect the tape placement all that much?
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Old 04-30-06, 07:31 PM   #4
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i would check it to make sure there isn't something sticking through. exploding tubes sounds like something sharp in there.
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Old 04-30-06, 07:44 PM   #5
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Quote:
Originally Posted by hester
that's correct. i made the switch over to singlespeed and had to tru the wheel over to compensate. i know it wasn't the best truing job done on limited time but it was pretty much straight sidewise. there is a small hop though and i think that may be the problem here...

i made it home that night without incident. the odd thing is, when i went to hop on it the next evening, the tube was shredded. i'm not talking puncture, puncture, hiss - but BANG! shredded. i can't recall being around when it happend and i like to think i would have heard it.

so i changed the flat a couple of days later, started riding and about a quarter of a mile down the road i felt (and heard) the tell-tale signs that something bad was about to happen and whaddaya know? POP! like a gunshot.

i need to know. what's causing this? did i screw the wheel up major?

By "tru'ing the wheel over" do you mean you reduced the dish to a more symmetrical setup? To do that you'd have to loosen all the drive side spokes and tighten all the non-drive side spokes. Since they weren't equal length to start with, you may have driven many of the non-drive side spokes up through the rim tape where they can puncture the tube.
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Old 04-30-06, 08:41 PM   #6
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When you re-trued the wheel, did you tighten some spokes especially tight? Run your finger along the inside rim and see if a spoke is poking through the rim tape.
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Old 04-30-06, 09:28 PM   #7
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When you re-trued the wheel, did you tighten some spokes especially tight? Run your finger along the inside rim and see if a spoke is poking through the rim tape.
If so, just file the bit of spoke above the nipple.
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Old 05-01-06, 01:33 PM   #8
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yeah... that dish thing. that's what i did. makes sense that they may be poking out a bit after that. *shrugs*

i did run my finger over the tape and found nothing too unusual. i pulled out the tubes and discovered that it blew in the same place both times, about two inches from the air valve which is, coincidentally, the ending and beginning of the rim tape. they overlap a bit and though it hadn't been a problem before, now that i have *ahem* reduced the dish to a more symmetrical setup (thanks for the technical terminology, dbg, now maybe people will understand me without having to resort to charades...;P), perhaps i pushed the overlap out with a spoke just enough that it rubs all wacky.

i'm guessing here...
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Old 05-01-06, 05:50 PM   #9
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if its near the valve, are you sure your just not pinching the tube when you've changed it ?
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Old 05-01-06, 07:37 PM   #10
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That's your reward for setting bicycle technology back about 80 years.
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