Bicycle Mechanics - front tubes keep popping please help
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I have an old Raleigh from the 80s I think. Ive had it about a month and just checked the tire pressure yesterday. I filled them up and about 20 yards down the road, the back tube pops. Then as Im walking it home the front pops. I got new tubes today and the back went fine but as I was filling the front it popped on me at about 60psi. I'm thinking it may be the tire because the metal rim is exposed in a couple spots but I'm not really sure. Any help would be appreciated.
05-22-09, 11:31 AM
check for burrs around the inside of the rim, make sure you have rim tape and check the inside of the tires themselves for glass, nail etc.
garage sale GT
05-22-09, 11:53 AM
* I assume you have rim tape and all spoke nipples are completely covered inside
* If you had a previous flat I assume you checked your tires to make sure you took out the thing that caused the puncture
*If the tube popped out between the rim and tire then you need to find a tire which works without hook bead rims.
05-22-09, 12:12 PM
As Garage Sale and Coho advised, your issues are related to either 1) Sharp objects still embedded in your tire(s)... 2) Burrs or exposed spoke heads within the wheel... Or 3) poor -fitting tires or improper installation.
Inspect your blown tubes carefully. The location of the punctures will help in diagnosing which issue(s) you need to deal with and where they are. Look very closely at the inside of the tire casing and the position and condition of your rim tape or strips. Also feel the rim carefully for the aforementioned burrs.
It doesn't take something very, large or sharp to puncture a tube.
i checked the rim and nothing was out of the ordinary. the first time i think it was just the fact that they were old tubes and it was very hot after a long ride. but the second time, i dont know. i keep thinking it has to be the tire itself because the metal is exposed. maybe it got pinched?
05-22-09, 02:26 PM
i keep thinking it has to be the tire itself because the metal is exposed. maybe it got pinched?
Metal exposed on the tire or the rim? There shouldn't be any exposed wire on the tire. Actually on the interior of the rim either, there should be either rim tape or a liner covering the exposed metal on the rim that would come in contact with the tube.
the exposed metal is on the tire, not the rim.
05-25-09, 06:47 PM
The steel bead-wire is no longer encased in the weave of the tyre. This means there's a hole in the sidewall of the tyre as well that the tube can sneak through. If you line up the blown spots on the tube with the tyre,it probably lines up with this damanged spot on the tyre. Replace the tyre with a good one.
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