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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 08-21-10, 11:22 PM   #1
RubberDucks
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Random Blown Tubes

I don't know what the hell keeps happening. My tubes just blow out, for absolutely no reason. it happened just now, my bike is sitting in my apartment and out of the blue I hear a hiss and my tires deflated. any ideas? It only happens when I run my tire pressure at about 100PSI if I run my tire less I have no issues. Im totally stumped.
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Old 08-21-10, 11:28 PM   #2
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Check if rim tape is seated correctly covering all of the spoke holes, then check of burrs/debris/stuff.
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Old 08-21-10, 11:34 PM   #3
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when I first started having this problem I replaced my old plasticky rim tape with cloth rimtape. the blown out areas always happen in the same place, but is absolutely nothing that is poking or cutting the tube. its right next to the valve hole on the bottom of the tube by the valve stem. I filed the rim hole and made sure nothing can puncture the tube but alas it keeps happening.
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Old 08-21-10, 11:39 PM   #4
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Check your tires to see if there's anything sticking in them too. And if your tubes are being pinched by the tire. And for porcupines. Check for those too.
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Old 08-21-10, 11:42 PM   #5
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Damn rodents!

Yup, do what Cglenny said.

Also, it could be you're are tearing the valve stem everytime you release the pump head, valve stems are usually the most vulnerable place on the tube.
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Old 08-21-10, 11:50 PM   #6
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Wrap some electrical tape around the valve stem hole. That helped me. I blew 3 tires at the stem in a week till I taped the hole. Helped loads.
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Old 08-21-10, 11:51 PM   #7
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no porcupines, no nothing just blown tubes. and no good reason
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Old 08-21-10, 11:57 PM   #8
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it never happens unless I inflate past 100psi, and almost never happens when I actually riding. it just happens, randomly. I am running 28C tires. could it be that standard tubes just cant handle the pressure Im inflating them to? It doesn't sound right but could it contribute to my problem
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Old 08-22-10, 12:04 AM   #9
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...you don't need to pump that high for a 28c tire.

Generally ~75 PSI is good enough.

Refer to this chart:
Quote:
Originally Posted by Psimet2001
Tip 1 - Inflate your tires before every single ride. Know what the proper inflation pressure should be for your tires. Inflation requirements will vary by rider, bike, tires, conditions, etc.

Below you will find equations that you can use to help determine an appropriate starting point using your weight and the tire's size. Adjust from these baselines to suit needs and conditions.

Proper inflation is the easiet way to avoid flats.

Tire Width=20: Pressure(psi) = (0.33 * Rider Weight in lbs) + 63.33
Tire Width=23: Pressure(psi) = (0.33 * Rider Weight in lbs) + 53.33
Tire Width=25: Pressure(psi) = (0.33 * Rider Weight in lbs) + 43.33
Tire Width=28: Pressure(psi) = (0.33 * Rider Weight in lbs) + 33.33

Tire Width=32: Pressure(psi) = (0.17 * Rider Weight in lbs) + 41.67
Tire Width=37: Pressure(psi) = (0.17 * Rider Weight in lbs) + 26.67


Example: You are 150lbs running 28's

Pressure (psi) = (0.33*150) +33.33 = 82.83psi (rear)
Front Pressure = .9*Rear Pressure = .9*82.83psi = 74.55psi front
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Old 08-22-10, 12:11 AM   #10
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I weigh 230 pounds, do the math
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Old 08-22-10, 12:17 AM   #11
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Fair enough, I was just trying to throw out what could be the problem.

It could be the wrong size tube, what size is it?
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Old 08-22-10, 12:34 AM   #12
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This might be repetitive but I had a very small piece of wire stuck through my tire that I missed and it punctured two or three tubes before I noticed it.

There could also be a small hole in the tire and when your tube is pumped high it could bubble through the hole.

Otherwise get a new bicycle, it doesn't like your style of pumping.
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Old 08-22-10, 12:54 AM   #13
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Quote:
Originally Posted by Cglenny View Post
This might be repetitive but I had a very small piece of wire stuck through my tire that I missed and it punctured two or three tubes before I noticed it.

There could also be a small hole in the tire and when your tube is pumped high it could bubble through the hole.

Otherwise get a new bicycle, it doesn't like your style of pumping.
I've double and triple checked all of that and no dice, and the hole is always on the underside of the tube.
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Old 08-22-10, 01:01 AM   #14
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New wheels?
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Old 08-22-10, 01:01 AM   #15
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Underside being facing the rim? I'm guessing you already looked at your rim where the holes are being made. You might get new rim tape, could be the rim tape. Is it old rim tape? Maybe it's rim tape.
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Old 08-22-10, 01:10 AM   #16
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changed the rimtape and no change in frequency of blowing tubes
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Old 08-22-10, 01:28 AM   #17
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There's only one way to fix this problem, as always it requires TONS of money - 808 tubulars.
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Old 08-22-10, 01:50 AM   #18
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you using a presta tube on the schrader drilled rim?
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Old 08-22-10, 02:37 AM   #19
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next time it blows, pull it out of the tyre in the exact orientation it was, and make a note of where the hole was in relation to the tyre/rim. then focus your efforts on searching that immediate area.
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