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Old 08-06-08, 12:08 PM   #1
jfruser
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Spoke-Induced Tube Puncture

Howdy:

Had a surprise after work the other day, as my rear tube was not just a little flat, but so flat the tire had become unset from the rim.

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Circumstances:
285lb rider
40lb gear
Specialized Hard Rock set up for commuting
Specialized Nimbus street slicks with 75/85 psi front/rear (80psi max on tire)* at 0500 and 77degF

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I dis-assembled wheel/tire/tube & found a puncture on the inside of the tube that matched a place where it appears the black rubber rim tape failed over one of the spokes (and was ready to fail elsewhere). Replaced tube & did a jury-rig rim tape patch with some package tape. It was good for 11+ miles back to my garage. I won't trust it again, however, until I resolve the issue.

It was fine in the AM on the way to work. I suspect that the tube pressure increased over the day, as it sat in the sun at the rack and our high temps have been around 105degF lately.

This is a new puncture for me. Ought the generic cloth-like rim tape at my LBS do the trick or do I need something more aggressive/specific?

I have thought about going with one of the "puncture resistant" tubes (which just look like thicker / heavier tubes). I am not one to squawk at a little weight, but they are about 4x the mass of the standard tube.



* Still not enough pressure for the weight it must carry, as it squashes down more than I'd like when under load with me & my gear. Any suggestions on a high-pressure / high-weight-capacity 26" MTB street slick?
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Old 08-06-08, 12:51 PM   #2
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Is the spoke actually protruding from the nipple? If so, you need to knock that down with a file or grinder.

Remove the nipple and cut the over-long spoke down so it won't stick up too high.

You've got quite a lot of weight there with the gear and all; consider going to a higher pressure tire after getting the spoke thing sorted.
You can easily find 100 pound rated tires for 26" wheels.
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Old 08-06-08, 12:57 PM   #3
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And, yes, once you make sure the spoke isn't protruding past the nipple, the cloth rim tape will be fine.
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Old 08-06-08, 05:33 PM   #4
jfruser
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Spoke is not protruding. The tube had to work its way up through the hole in the rim to find the spoke.

I should be good-to-go, since I had bought some of the cloth rim tape "just in case."

Thanks for the replies.
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Old 08-06-08, 05:52 PM   #5
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Nothing works as well as Velox cloth tape. I had problem with plastic and rubber rim tape. I switched to cloth and won't use anything esle.
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Old 08-06-08, 06:42 PM   #6
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Do not buy "thorn-proof"/puncture resistant tubes. Waste of money, waste of weight. For that matter don't bother with tire liners either.
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Old 08-06-08, 07:24 PM   #7
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I've had the rim tape fail like that at one of the eyelets as well. And just as you found it's the end of the tube which then herniates into the opening and bursts. However one bit of good or bad news is that it's got nothing at all to do with the weight being packed on the bike. It's just the air pressure that did this.

Go with a good quality fiber tape like the Velox or similar. In my case I like to use two wraps of 1/2 inch wide fiber strapping tape for stuff like that. Since I switched to that I've had zero problems over a lot of years of riding.

A nice higher pressure option is Ritchey Tom Slicks. 1.5 inch wide and take 100 psi. And they roll well.
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Old 08-06-08, 07:37 PM   #8
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If the rim tape did fail, you may also have the start of other punctures in that same tube at different spoke holes that cannot be seen unless it is stretched. Replace the tube when you replace the rim tape.
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