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Old 05-02-10, 09:17 PM   #1
amiexploited
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new 700x28c tire, lots of flats

I just got a new fyxation 28c tire, and I've gotten 3 flats this weekend. I didn't have any flats on my old tires. I'm using velox tape and I don't feel anything sharp where it popped.
The whole is next to the valve on the edge of the oval.

I'm using specialized 700x20/28c tubes.
All the other threads I checked said regular tubes would be fine for a 28c tire.

Should I try new rim tape even though it looks fine? The hole isn't even on top of a spoke hole.

Last edited by amiexploited; 05-02-10 at 09:35 PM.
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Old 05-02-10, 09:19 PM   #2
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Moving to bike mechanics.
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Old 05-02-10, 10:08 PM   #3
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Are all the holes in the same place? If so pull the rim tape up and check it. Replace if anything funny found. Maybe try a different brand of tube? I don't see anything that jumps out.
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Old 05-02-10, 10:13 PM   #4
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Good picture. Are the flats all in the same place? What pressure are you running? Bad batch of tubes? < Scratches head >
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Old 05-02-10, 10:21 PM   #5
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Either:
a) defective tube
b) tube damaged during installation

I would suspect "a".
I had a new tube fail in that same spot a couple days after installation.
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Old 05-02-10, 10:39 PM   #6
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Could it be a defective tube three times in a row? I used a different brand the first time and the last three times were specialized tubes. The only thing about the rim tape that I can notice is that I can feel the shape of the spoke hole with my finger. Is that enough to damage the tube? It has only deflated when the bike is just sitting there.
I run the tire at 100 psi (tire says 80-110psi).

Last edited by amiexploited; 05-02-10 at 10:40 PM. Reason: wrong psi
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Old 05-02-10, 10:45 PM   #7
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If you are getting the leak in the same place multiple time, and especially with different brand tubes, then I doubt it is defective tubes.
The tape looks fine in the photo, (as far as I can tell).
Are you doing something during installation that would be stressing the tube?
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Old 05-02-10, 11:01 PM   #8
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I'm using tire levers and making sure with my finger I'm not pinching the tube. I put a lil strip of the overlapping rim tape under the tube where it normally gets the hole. Hopefully that helps. I'm going to try new tape all together and 700x28/32 tubes.

thanks everyone for the help too
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Old 05-02-10, 11:07 PM   #9
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A friend at work showed me this. When you have a flat, mark with a paint pen onto the tire, the location of the valve. When you remove said tube, take note of its orientation and then pump it up to find where the puncture is. Now go back to the tire and use the tube to identify exactly where the tire was penetrated. Now take a metal scribe or pointed object of some kind and dig around in the cut to find the sharp bit which is probably still wedged in the tire. Don't rely on feeling the inside of the tire - no certainty the sharp bit will be protruding. If you fail to get all traces of the sharp bit out of the cut in the tire it will just puncture your tube again and again. In my case there was a slither of glass, very sharp, well hidden in the carcass of the tire. I have a big problem in Brisbane with hooligans in cages tossing bottles on the road. You sometimes just about need a microscope to find the tiny little glass chips.
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Old 05-03-10, 12:00 AM   #10
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Originally Posted by 009jim View Post
A friend at work showed me this. When you have a flat, mark with a paint pen onto the tire, the location of the valve. When you remove said tube, take note of its orientation and then pump it up to find where the puncture is. Now go back to the tire and use the tube to identify exactly where the tire was penetrated. Now take a metal scribe or pointed object of some kind and dig around in the cut to find the sharp bit which is probably still wedged in the tire. Don't rely on feeling the inside of the tire - no certainty the sharp bit will be protruding. If you fail to get all traces of the sharp bit out of the cut in the tire it will just puncture your tube again and again. In my case there was a slither of glass, very sharp, well hidden in the carcass of the tire. I have a big problem in Brisbane with hooligans in cages tossing bottles on the road. You sometimes just about need a microscope to find the tiny little glass chips.
The puncture is clearly on the underside of the tube near the valve stem, that method would only work if the puncture is on the outer side of the tube.

I actually have the same problem as you do, a leak kept on happening near the valve stem. I have a DA22 rim, it is slightly profiled and I pump it up to ~110 PSI too. The holes on the rim were sharp enough to puncture my tube and tore a small hole in my rim tape. I did the sensible thing to inspect the rim and found tiny piece metal sticking through, I changed the tape and haven't got a flat since then.
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Old 05-03-10, 12:03 AM   #11
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peel the tape off and inspect for burrs on the holes.
if there are burrs, go at it with a fine rat tail metal file.
reinstall tape. preferable to use new tape, but reusing it should be fine.
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Old 05-03-10, 08:04 AM   #12
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That looks like a tire lever pinch to me. You should not need to use tire levers to re-install a tire. You should also start seating the tire at the valve stem and work your way around both sides and meet up opposite the valve stem. If you are already doing so, then I'm not sure how you could get that...
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Old 05-03-10, 10:19 AM   #13
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So it must be my own fault? Sucks, because I just got another flat after using tire levers. I put an extra strip of rim tape over the rim where it gets the hole.
I'll try without the levers.
Thanks.
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Old 05-03-10, 10:28 AM   #14
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What kind of pump are you using?

If you're using a mini-pump or a frame pump that doesn't have a hose, it's really important to stablize the valve stem as you inflate the inner tube. Otherwise you rock the valve stem back and forth and tend to tear the inner tube where the valve is bonded.
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Old 05-03-10, 11:58 AM   #15
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Originally Posted by nymtber View Post
That looks like a tire lever pinch to me.

Me too.... it has the symmetry of a folded and pinched tube.

Try levering over the last part of the tyre opposite the valve (process of elimination) and see if the flat happens there.

If it's really tight getting the tyre on, use washing up liquid for the last bit and wiggle the lever around, so the lever slips off the tube if it makes contact (difficult to do on the open road). Obviously inflate the tube a little (I guess you know that?). Finally, try easier to fit tyres.

Last edited by Monkey Face; 05-03-10 at 12:02 PM.
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Old 05-03-10, 12:05 PM   #16
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This article does a nice job of explaining how to do a leverless tire install.

http://www.teamestrogen.com/content/asa_levers
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Old 05-03-10, 12:09 PM   #17
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Originally Posted by nymtber View Post
That looks like a tire lever pinch to me. You should not need to use tire levers to re-install a tire. You should also start seating the tire at the valve stem and work your way around both sides and meet up opposite the valve stem. If you are already doing so, then I'm not sure how you could get that...
Depends on the tire-rim combination. I've had some pop on by hand, and others that require massive force. If you do use a lever to install the tire for the last section, don't pry it all the ay on - that's when the pinch happens. Pry it up so the lever is 90 degrees to the wheel, and work along until it's all the way on.

The location in this case doesn't look lever induced since it's where the tube contacts the tape.

Maybe the tube is too small, so it's getting stretched & stressed too much at the oval seam ? The tire looks big compared to the tube.
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Last edited by Homebrew01; 05-03-10 at 01:11 PM.
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Old 05-03-10, 04:31 PM   #18
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The location in this case doesn't look lever induced since it's where the tube contacts the tape.

Maybe the tube is too small, so it's getting stretched & stressed too much at the oval seam ? The tire looks big compared to the tube.
Thats what I was thinking at first. The tubes say 700x23/28, and I'm using a 28c tire. Lots of people on the forums say that regular tubes (700x23/25) will be fine.
I'm gona get tubes that say 700x28/32 to see if that works
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Old 05-03-10, 06:38 PM   #19
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lots of strange information in this thread.

you are installing your tire/tube incorrectly. there's lots of threads on how to do this, but i'll make it short and sweet.

with tire and tube off the bike, match the stem up with the tire label (label goes on right side).
put a little air in the tube. just enough to give it a little shape.
start with the stem. insert it and one bead of the tire (start at the stem). take care that the stem is straight and not at an angle.
once the first bead is installed, start with the outside bead at the stem. push the stem up into the tire to help the bead set.
work your way around the tire, pushing the tube as far up inside the tire as you can as not to pinch it.
you should end directly across the wheel from the stem.
pump your tire up to about 10lbs and shove the valve/stem up into the tire. this will ensure that it is set up in the tire.

inflate to max psi. if you notice the stem starting to become angled, do over.

Last edited by illwafer; 05-03-10 at 06:42 PM.
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