I would suggest just try a new tube.
It's a slime lite tube. Not that cheap really. $13Bikinfoolferlife said:Tubes aren't exactly a high quality control item...they're cheap, sometimes you get a bad one.
Yeah, I was having pinch flats with the stock rim tape that were a tape width apart. That's why I replaced it with the velox. Maybe the velox isn't that great a tape though???lkoky said:I have the exact problem on my new bike after I changed the stock tyre.
Had two flats since then, all the holes were on the rim side, this problem seems to go away after I changed the stock rim tape.
The rim is a double wall rim and when I put the new tape on I did inspect the spoke heads. All the heads were about 3 or 4mm below the surface of the second wall. If the rim doesn't flex enough to have a spoke poke up that far I don't see how a bur could be a factor. Do the rims work this way? If so I may need to take my drimmel to those heads.Squash said:my suggestion would be to pull the tape and closely inspect the rim, spoke heads (or spoke holes if it's a double wall rim), etc. That deffinately looks like a problem with either the tape or the rim itself. Look for any burs or sharp protursions that may stick through the rim tape or work through the tape with the tube installed and pressurized. A bur or nick in the spoke bed area may not show up with fresh tape over it, but may work through the tape with pressure on it.
My guess that you will find spoke heads or access holes with burs on them that poke through the tape. This can be fixed by takinig some fine grit sand paper to the burs. Painstaking and time consuming, but the only way to fix the problem other than going with that nasty plastic rim tape.
As Bikinfool says, tubes aren't exactly a high quality item as far as QC goes. But your problem seems too consistant to be just a bad tube. You could try changing out the tube and seeing if you get the same results. That would confirm it one way or the other. But I'd be willing to bet the problem probably isn't the tube, but the rim itself.
Good Dirt
tiny pin holes like maybe what a cactus would make or even something smaller. Actually come to think of it I could rake my fingernail across it and feel the rubber edge so it's probably more like a cut than a puncture.jeffscott said:From the look of the patches centered inside of tube. I think you gotta suspect the spokes or spoke holes allowing the thin wall tube to bulge into?
What do the punctures look like. smile, poke, circle?
This is just nuts. I had another flat this time on my front rim. Same thing, the hole was on the rim side. I checked where the hole was in relation to the valve stem and there is absolutely nothing there to poke a hole. The rim tape is stuck tightly there are no share objects poking through. I just don't get this. It makes no sense. But so far I have had about 6 or 7 flats all as a result of something between the rim tape and the tube. Something isn't right here and I can't explain it.Squash said:my suggestion would be to pull the tape and closely inspect the rim, spoke heads (or spoke holes if it's a double wall rim), etc. That deffinately looks like a problem with either the tape or the rim itself. Look for any burs or sharp protursions that may stick through the rim tape or work through the tape with the tube installed and pressurized. A bur or nick in the spoke bed area may not show up with fresh tape over it, but may work through the tape with pressure on it.
My guess that you will find spoke heads or access holes with burs on them that poke through the tape. This can be fixed by takinig some fine grit sand paper to the burs. Painstaking and time consuming, but the only way to fix the problem other than going with that nasty plastic rim tape.
As Bikinfool says, tubes aren't exactly a high quality item as far as QC goes. But your problem seems too consistant to be just a bad tube. You could try changing out the tube and seeing if you get the same results. That would confirm it one way or the other. But I'd be willing to bet the problem probably isn't the tube, but the rim itself.
Good Dirt
Well, there is a logistical issue with slime tubes and holes you know. In order for it to work the holes need to be on the outer part of the tube. That is where the slime is going while the wheel is spinning. Down at the rim side, hardly any slime is there.Bikinfoolferlife said:All I meant the first time around was like Squash says, not a high QC item. Now I'm surprised to see they were slime tubes and the slime doesn't patch such small holes?
Did you try airing up these tubes before installation by any chance to see if they were bad on their own? Are these flats all on the first pair of tubes? Have you tried using a regular tube and seeing if it flats the same way? Got pics of your rims/tape? Just grabbing straws here, but I've yet to even bother with a patch on any slime tube I've used, let alone have any tube fail from a smooth and well taped rim surface.