Bicycle Mechanics - flats on rim side of tube keep coming!
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09-12-11, 11:20 AM
Ok! I was using these puncture resistant tubes on my back rim of my MTB now turned urban mule. I had puncture resistant tubes on there but they weighed 90 lbs each so I switched them out for standard tubes. Now, I got a hole on the rim side of the tube. So I bought some velox tape and replaced that on the rim and I got another one in one day. I pulled the tape off and ran my finger over where the spoke comes through the rim (I'm sure it has a name) and I feel some slight sharp edges. Nothing like a pinhead or anything like that but I can feel it. Can that be my problem or is there something that I am missing to rim tape?
I should also add that I didn't have this problem when I used low pressure tires but now that I am at higher pressures, it is happening. This is what has me wondering if the sharp spots can be the problem.
It has made my girl unreliable and I can't ride anywhere. HELP ME! If I took it to my lbs would they be able to tell me?
09-12-11, 11:34 AM
would I be nuts if I put one of those rubber band rim tape deals and then velox over that? I'm getting thoroughly angry.
09-12-11, 11:53 AM
If you want to try, I'd use the velox first and then rim tape second.
But, if the hole in the tube matches the location where the spoke is poking through, then the proper solution is not to keep putting more layers over sharp points. The tube is under pressure and possibly will stretch to fill in all available voids. Rim tape helps with ridges, and reducing the sharp offsets and edges that can slice tubes open. But they don't do well in protecting against points. Over time, points eventually work through. If you have spokes poking through, you might try to cut and grind them relatively smooth, and then get the proper width rim tape/rim strips for coverage. I've seen spoke caps for inside the rim too, which can work, especially with sticky rim tape that will hold it in place. But it's hard to beat a wheel that has the proper length spokes to start with.
09-12-11, 04:05 PM
Well...I have found that on the tube, there is a 2 inch line that appears rough like it was from rubbing on something and then there is a hole in the middle of it. Not an explosive star shaped hole but a small hole none-the-less. I also noticed a spot on the rim where the rim tape had moved off center a bit. Can my rim tape have rubbed through the rim? I wish I had paid more attention to where these parts lined up. oh well.
Don't let the things that you can't do keep you from doing the things you can. - Coach Wooden
Velox should not move once installed. Did you use the correct width Velox for your rims?
If any part of the spoke hole is exposed to the tube it will flat.
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