Random Blown Tubes
08-21-10, 11:22 PM
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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.
08-21-10, 11:34 PM
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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.
08-21-10, 11:39 PM
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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.
08-21-10, 11:42 PM
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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.
08-21-10, 11:50 PM
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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.
08-21-10, 11:51 PM
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no porcupines, no nothing just blown tubes. and no good reason
08-21-10, 11:57 PM
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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
08-22-10, 12:04 AM
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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:
Generally ~75 PSI is good enough.
Refer to this chart:
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
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
08-22-10, 12:11 AM
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I weigh 230 pounds, do the math
08-22-10, 12:34 AM
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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.
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.
08-22-10, 12:54 AM
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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.
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.
08-22-10, 01:01 AM
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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.
08-22-10, 01:10 AM
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changed the rimtape and no change in frequency of blowing tubes
08-22-10, 01:28 AM
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There's only one way to fix this problem, as always it requires TONS of money - 808 tubulars.
08-22-10, 02:37 AM
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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.
