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Mountain bike punctures - valve being torn off.
I keep getting punctures on my mountain bike, where the Schraeder valve has
been pulled off the tube. Clearly, the tyre is rotating slightly on the rim under braking, and pulling the tube along with it, which eventually rips the valve off. Tyres are 2.25" Panaracers, running at a fairly low pressure, and are well within the maximum specs for the rim (I think the max is 2.5"). I don't want to increase pressure, unless I really have to. Any ideas on possible remedies? I don't really want to superglue the tyres to the rim... The tyres are also about 4 years old, if that makes any odds. |
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#2
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Mountain bike punctures - valve being torn off.
On Sep 14, 8:18*am, "Doki" wrote:
I keep getting punctures on my mountain bike, where the Schraeder valve has been pulled off the tube. Clearly, the tyre is rotating slightly on the rim under braking, and pulling the tube along with it, which eventually rips the valve off. Tyres are 2.25" Panaracers, running at a fairly low pressure, and are well within the maximum specs for the rim (I think the max is 2.5"). I don't want to increase pressure, unless I really have to. Any ideas on possible remedies? I don't really want to superglue the tyres to the rim... The tyres are also about 4 years old, if that makes any odds. Do the valves have threaded stems with retainers on them or are they just pushed in? |
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Mountain bike punctures - valve being torn off.
Just zis Guy, you know? wrote:
On Sep 14, 8:18 am, "Doki" wrote: I keep getting punctures on my mountain bike, where the Schraeder valve has been pulled off the tube. Clearly, the tyre is rotating slightly on the rim under braking, and pulling the tube along with it, which eventually rips the valve off. Tyres are 2.25" Panaracers, running at a fairly low pressure, and are well within the maximum specs for the rim (I think the max is 2.5"). I don't want to increase pressure, unless I really have to. Any ideas on possible remedies? I don't really want to superglue the tyres to the rim... The tyres are also about 4 years old, if that makes any odds. Do the valves have threaded stems with retainers on them or are they just pushed in? I've had both kinds, and done it to both. |
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Mountain bike punctures - valve being torn off.
Any ideas on possible remedies? I don't really want to superglue the tyres to the rim... The tyres are also about 4 years old, if that makes any odds. I can only think that the cause of the problem is the tyre moving around the rim and taking the inner with them. If it's a recent thing I'd change your tyres, maybe they're getting knackered around the bead? Pete. -- Peter Clinch Medical Physics IT Officer Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital Fax 44 1382 640177 Dundee DD1 9SY Scotland UK net http://www.dundee.ac.uk/~pjclinch/ |
#5
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Mountain bike punctures - valve being torn off.
"Doki" wrote in message
... I keep getting punctures on my mountain bike, where the Schraeder valve has been pulled off the tube. Clearly, the tyre is rotating slightly on the rim under braking, and pulling the tube along with it, which eventually rips the valve off. Tyres are 2.25" Panaracers, running at a fairly low pressure, and are well within the maximum specs for the rim (I think the max is 2.5"). I don't want to increase pressure, unless I really have to. Any ideas on possible remedies? I don't really want to superglue the tyres to the rim... The tyres are also about 4 years old, if that makes any odds. The low pressure is your problem, allowing the tyre to rotate. the solution is to increase the pressure!! pk |
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Mountain bike punctures - valve being torn off.
On Mon, 14 Sep 2009 08:18:07 +0100, "Doki" wrote:
I keep getting punctures on my mountain bike, where the Schraeder valve has been pulled off the tube. Clearly, the tyre is rotating slightly on the rim under braking, and pulling the tube along with it, which eventually rips the valve off. Tyres are 2.25" Panaracers, running at a fairly low pressure, and are well within the maximum specs for the rim (I think the max is 2.5"). I don't want to increase pressure, unless I really have to. Any ideas on possible remedies? I don't really want to superglue the tyres to the rim... The tyres are also about 4 years old, if that makes any odds. Haven't seen these for years, and TBH I'm not even certain they were ever made for pedal cycles, but some trials motorbikes, running very low pressures in tubed tyres, would have a retaining device bolted through the rim. This would be a shaped flat plate, sized to fit between the beads of the tyre, but within the rim, and would be securely tightened from the outside. Not the best description, so I'll try some ASCII art instead. | | ---- Tyre | plate | \ | / \ \ V / / ---- Rim \ \============= / / \ \ || / / \______||______/ [||] Not sure that helps, nor where you would find such a thing, but hopefully you'll get the idea. |
#7
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Mountain bike punctures - valve being torn off.
Mon, 14 Sep 2009 09:33:52
uk.rec.cycling pk "Doki" wrote in message ... I keep getting punctures on my mountain bike, where the Schraeder valve has been pulled off the tube. Clearly, the tyre is rotating slightly on the rim under braking, and pulling the tube along with it, which eventually rips the valve off. Tyres are 2.25" Panaracers, running at a fairly low pressure, and are well within the maximum specs for the rim (I think the max is 2.5"). I don't want to increase pressure, unless I really have to. Any ideas on possible remedies? I don't really want to superglue the tyres to the rim... The tyres are also about 4 years old, if that makes any odds. The low pressure is your problem, allowing the tyre to rotate. the solution is to increase the pressure!! That is what I think too. -- Wm... Reply-To: address valid for at least 7 days |
#8
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Mountain bike punctures - valve being torn off.
"Ace" wrote in message ... On Mon, 14 Sep 2009 08:18:07 +0100, "Doki" wrote: I keep getting punctures on my mountain bike, where the Schraeder valve has been pulled off the tube. Clearly, the tyre is rotating slightly on the rim under braking, and pulling the tube along with it, which eventually rips the valve off. Tyres are 2.25" Panaracers, running at a fairly low pressure, and are well within the maximum specs for the rim (I think the max is 2.5"). I don't want to increase pressure, unless I really have to. Any ideas on possible remedies? I don't really want to superglue the tyres to the rim... The tyres are also about 4 years old, if that makes any odds. Haven't seen these for years, and TBH I'm not even certain they were ever made for pedal cycles, but some trials motorbikes, running very low pressures in tubed tyres, would have a retaining device bolted through the rim. This would be a shaped flat plate, sized to fit between the beads of the tyre, but within the rim, and would be securely tightened from the outside. Not the best description, so I'll try some ASCII art instead. | | ---- Tyre | plate | \ | / \ \ V / / ---- Rim \ \============= / / \ \ || / / \______||______/ [||] Not sure that helps, nor where you would find such a thing, but hopefully you'll get the idea. Yep, I know what you mean. Never heard of them being available for pushbikes though - I suspect most racers use higher pressures and ride full suspension, or go tubeless, so there's no real market for something like that (extra weight). |
#9
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Mountain bike punctures - valve being torn off.
Doki wrote:
I keep getting punctures on my mountain bike, where the Schraeder valve has been pulled off the tube. Clearly, the tyre is rotating slightly on the rim under braking, and pulling the tube along with it, which eventually rips the valve off. Tyres are 2.25" Panaracers, running at a fairly low pressure, and are well within the maximum specs for the rim (I think the max is 2.5"). I don't want to increase pressure, unless I really have to. Any ideas on possible remedies? I don't really want to superglue the tyres to the rim... The tyres are also about 4 years old, if that makes any odds. Have you got enough pressure in them? Tubes move about at low pressure. How about the recommended max/min? Failing that, different rim tape or glue the buggers in. -- Come to Dave & Boris - your cycle security experts. |
#10
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Mountain bike punctures - valve being torn off.
Mon, 14 Sep 2009 10:48:34
uk.rec.cycling Doki Yep, I know what you mean. Never heard of them being available for pushbikes though - I suspect most racers use higher pressures and ride full suspension, or go tubeless, so there's no real market for something like that (extra weight). Just curious, why don't you want to increase the pressure if that would solve the problem? -- Wm... Reply-To: address valid for at least 7 days |
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