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front wheel flat mystery

Old 06-06-19, 06:24 PM
  #1  
Teamprovicycle
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front wheel flat mystery

ok im so confused on this one i really dont get it ,

i am practicing some hills for a hill race on my more hill cimb -ish bike , tarmac sl2 with mavic ksyrium elite wheels , as well as sram rival brakes .

this bike , wheels have been running just fine , the wheel since october 2018 and the tires and tube since march , not even one hiccup or flat until today ,

i had rested the wheels and ran my other mavic cosmic tubeless wheels , but they are slightly heavier , so i wanted to run the ksyriums , i re packed the bearing greese , and set them up for a hill training session .

not even 2 miles in i get a PSSSSSSSSSSSS hole on the inside , i patch it set off again PSSSSSSSSSSSS again patch set offf PSSSSSSSSSSSSS !!!!!!!!!

6 flats in 6 miles on the front wheel , i rubbed and felt and inspected tire , wheel tire , wheel ,wheel ,tire , tire , tire , wheel , wheel , tire , tire , NOTHING !!!!!

not a sharp edge or even bump and the rim is sealed there are no spoke holes just solid rim with no tape !!! .

i though maybe the brakes are causes a massive heat spot ???? but its not like im descending for 3 miles im just going up a hill and down a hill ....

i have no clue why i get this hole on the inner side of the tube , i have never ever seen this in my days of riding , if you have any clue what could be going on please let me know .

i only have 2 days until the race so if cant run these wheel maybe i just use the tubeless wheels but then there running tubeless and all the great things that go alaong with that !!!

Last edited by Teamprovicycle; 06-06-19 at 07:17 PM.
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Old 06-06-19, 06:45 PM
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If you mean on the spoke side of their inner tube when you say “inner side of the tube” I would suspect that you need to replace your rim tape. It can look OK but then when you inflate the tube it can creep and expose one of the spoke holes and then slide back into place when the tube deflates.
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Old 06-06-19, 07:18 PM
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Originally Posted by KLiNCK View Post
If you mean on the spoke side of their inner tube when you say “inner side of the tube” I would suspect that you need to replace your rim tape. It can look OK but then when you inflate the tube it can creep and expose one of the spoke holes and then slide back into place when the tube deflates.
there are no spoke holes in the wheel at all , and its been thousands of miles with this never happening , very few normal tire side flats !!!!!!
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Old 06-06-19, 08:55 PM
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There must be something in your tire which is puncturing the tube. Take the tire off of the wheel, keeping track of where the hole is in the tube relative to the tire, turn it inside out and run a cotton ball or microfiber cloth around the inside of the tire where the hole in the tube is. You may need to put a reverse curve in the tire to open where it is hiding, but there has got to be something. Radial tire wires are very thin and difficult to see, as is glass, but the fibers should catch on it.
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Old 06-06-19, 09:52 PM
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If you can't determine what caused the flat, patching the tube or blindly installing a new tube generally results in another flat, as you're finding out!

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Old 06-06-19, 10:15 PM
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6 flats? Find each hole, then look at the same location on the tire and rim. The problem will be there. (And if you are careful about not twisting the innertube when you put it in, you will know whether it is tire or rim.) I trust you always mount your tire with the label in the same place relative to the rim or some other way of relating tire and rim/valve. Label at the valve on the drive-side is the current "standard". Take your patched tube, place it against the wheel and look at the patch location for the problem. (I'll confess I have to look at both sides of the wheel, ahead and behind the valve, since I don't track which way I put inner tubes in.)

I've had many flats caused by the tiny wire from car/truck tire steel belts. Barely thicker than a hair and can be of length shorter than your tread and casing so as not to show either from the inside or outside. Those patches are a huge help in finding those wires. Until you fish it out, that wire will keep causing flats. Also inspect the rim strip and rim very carefully at the flat location.

Ben
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Old 06-06-19, 11:52 PM
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Originally Posted by dsbrantjr View Post
There must be something in your tire which is puncturing the tube. Take the tire off of the wheel, keeping track of where the hole is in the tube relative to the tire, turn it inside out and run a cotton ball or microfiber cloth around the inside of the tire where the hole in the tube is. You may need to put a reverse curve in the tire to open where it is hiding, but there has got to be something. Radial tire wires are very thin and difficult to see, as is glass, but the fibers should catch on it.
so the hole is on the inside , rim side , maybe slightly to the side , maybe its in the side wall , the only thing i have touched in since MARCH is adjust the brake pad up a bit it was sitting low , every time i get this hole its in a different spot , i have never seen a whole just appear like this ,

in this session i tried to do , it only happening on the downhills , they are steep hills and there is a bit of heat on the rim , but i dont think it could cause a hole like this :I
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Old 06-06-19, 11:58 PM
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Originally Posted by 79pmooney View Post
6 flats? Find each hole, then look at the same location on the tire and rim. The problem will be there. (And if you are careful about not twisting the innertube when you put it in, you will know whether it is tire or rim.) I trust you always mount your tire with the label in the same place relative to the rim or some other way of relating tire and rim/valve. Label at the valve on the drive-side is the current "standard". Take your patched tube, place it against the wheel and look at the patch location for the problem. (I'll confess I have to look at both sides of the wheel, ahead and behind the valve, since I don't track which way I put inner tubes in.)

I've had many flats caused by the tiny wire from car/truck tire steel belts. Barely thicker than a hair and can be of length shorter than your tread and casing so as not to show either from the inside or outside. Those patches are a huge help in finding those wires. Until you fish it out, that wire will keep causing flats. Also inspect the rim strip and rim very carefully at the flat location.

Ben
the holes on are the rim side or slightly to the side wall , i haven't touched these wheels , i put the tires on in march i haven't even had a flat on the tire side , not one issue ,

i go to do the session and this happens , i really have no clue , i inspected the f out of the tube , tire , and wheel , pulled the tire off flipped in inside out , ran my finger over the wheel well , the tire beads , lined up the tube valve , put the tube on the wheel looked for anything , there is nothing ....

the only consistent thing that is happening is the tube is popping on the down hill while on the front brakes , so im leaning toward maybe a heat issue caused by when i adjusted the brake pad up a bit , but even that is pretty normal in a normal spot , never gave me any issues im totally lost right now !!
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Old 06-07-19, 01:46 AM
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so i peeled black the tire ( gp4000) tire bead and saw a hole and exposed fibers , it doesn't show unless i bend the bead in that area , this might explain it , i cant be sure unless i buy new tires !
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Old 06-07-19, 02:00 AM
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Do you take the tire off the rim when you patch/swap out the tubes? Are you careful to always put the tire back on in the same place on the riml? If yo do that, then a problem in the tire., it will always flat the tubes the same distance from the valve. YOu will know by your sewcopnd flat botht that it is the tire (or rime) at issue and where the problem is.
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Old 06-07-19, 10:53 AM
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Originally Posted by Teamprovicycle View Post
so i peeled black the tire ( gp4000) tire bead and saw a hole and exposed fibers , it doesn't show unless i bend the bead in that area , this might explain it , i cant be sure unless i buy new tires !
This sounds more likely to be the problem than not. Overheating is not the problem, it sounds mechanical in nature. Is there a particular shape to the punctures? You could put a piece of tape over the hole/exposed fibers... If you flat again, examine the tape...It will tell you if that is where your problem is. No crash worries with the flats? Cause if there are, who gives a dang about the cost of a new tire?
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Old 06-07-19, 11:01 AM
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So? put on a brand new tire.. check the rim strip as you replace the tire..

in a similar situation, I put in a thicker heavy duty inner tube ,

my tastes are not for carbon fiber wing bikes ..
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Old 06-10-19, 07:37 AM
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Sometimes a cut or hole or tear in the sidewall of the tire can be very hard to spot, but will cause a flat every time you put air in the tube. A badly adjusted brake pad is a common cause for this type of tire damage, as is a wheel not fully seated in the dropouts (which leads to pad misalignment).
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Old 06-10-19, 09:26 AM
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Originally Posted by Teamprovicycle View Post
so i peeled black the tire ( gp4000) tire bead and saw a hole and exposed fibers , it doesn't show unless i bend the bead in that area , this might explain it , i cant be sure unless i buy new tires !
I always have a few extra "wear" items available, since I will need them anyway. Tires, tubes, chains, cassettes....

Sounds like you need a new tire.
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Old 06-13-19, 11:33 AM
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Originally Posted by Homebrew01 View Post
I always have a few extra "wear" items available, since I will need them anyway. Tires, tubes, chains, cassettes....

Sounds like you need a new tire.
thanks
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