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Pumbaa
Worn
Joined: Jun 25, 2003
Posts: 827
Location: The Naki
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 Posted: Wed 13/Apr/05 4:17pm Post subject: |
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Good thinking.
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Dougal
Gone
Joined: May 16, 2003
Posts: 8,474
Location: Coasting
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| Posted: Wed 13/Apr/05 6:00pm Post subject: |
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Why not just deburr the edge of the valve hole?
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Stun
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Joined: Jan 03, 2003
Posts: 35,353
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| Posted: Wed 13/Apr/05 6:16pm Post subject: |
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Because that would require a craft knife silly
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sarahk
Dusty
Joined: Jun 09, 2004
Posts: 99
Location: Pt Chevalier
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| Posted: Wed 13/Apr/05 6:31pm Post subject: |
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| Dougal wrote: | | Why not just deburr the edge of the valve hole? |
No visible "burrs", infact it doesn't even seem sharp. Worn smooth and barely hanging in there would be how I'd describe it.
S
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Dougal
Gone
Joined: May 16, 2003
Posts: 8,474
Location: Coasting
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| Posted: Wed 13/Apr/05 7:48pm Post subject: |
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Are you using those valve nuts on the outside?
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sarahk
Dusty
Joined: Jun 09, 2004
Posts: 99
Location: Pt Chevalier
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| Posted: Thu 14/Apr/05 7:43am Post subject: |
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both sides 
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Dougal
Gone
Joined: May 16, 2003
Posts: 8,474
Location: Coasting
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| Posted: Thu 14/Apr/05 5:31pm Post subject: |
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| sarahk wrote: | both sides
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Throw them away, they're an evil ploy by tubemakers to sell more tubes. All they do is rip the valve stem out.
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sarahk
Dusty
Joined: Jun 09, 2004
Posts: 99
Location: Pt Chevalier
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| Posted: Thu 14/Apr/05 8:58pm Post subject: |
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| Dougal wrote: | | Throw them away, they're an evil ploy by tubemakers to sell more tubes. All they do is rip the valve stem out. |
Which was the original problem... 
I'll set one bike up one way, another up the other and see what happens
S
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Percy Pig
Mangled
Joined: May 03, 2002
Posts: 22,709
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| Posted: Thu 14/Apr/05 10:27pm Post subject: |
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| Dougal wrote: | | sarahk wrote: | both sides
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Throw them away, they're an evil ploy by tubemakers to sell more tubes. All they do is rip the valve stem out. |
kcollobs,I always run them(except with the ghetto tubeless) and have never ripped a stem out,lack of talc or parc tyres will do it,if the tyres rotate on the rim cos the bead isnt gripping properly and the tube has stuck to the tyre it'll rip the stem off.
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Dougal
Gone
Joined: May 16, 2003
Posts: 8,474
Location: Coasting
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| Posted: Fri 15/Apr/05 4:37pm Post subject: |
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| Percy Pig wrote: | | Dougal wrote: | | sarahk wrote: | both sides
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Throw them away, they're an evil ploy by tubemakers to sell more tubes. All they do is rip the valve stem out. |
kcollobs,I always run them(except with the ghetto tubeless) and have never ripped a stem out,lack of talc or parc tyres will do it,if the tyres rotate on the rim cos the bead isnt gripping properly and the tube has stuck to the tyre it'll rip the stem off. |
I stopped running them about 10 years ago when I ripped a couple of valve stems out. I haven't had it happen since.
I don't believe that talcing the tubes makes any difference. In a 2" tube there are over 2000 square centimetres of tyre to tube contact, mulitply that by the tyre pressure (30psi = 200kpa = 2 kg/cm, roughly) and you've got about four ton of force holding the tyre against the tube.
If you think that a little talcum powder can drop that enough for the valve to hold without ripping, then that's fine. But I think it's a little unrealistic.
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Stun
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Joined: Jan 03, 2003
Posts: 35,353
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| Posted: Fri 15/Apr/05 4:42pm Post subject: |
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I run talc, but no parcpy little nuts.
Then again - I run Schrader... and haven't punctured in well over two years.
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Dougal
Gone
Joined: May 16, 2003
Posts: 8,474
Location: Coasting
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| Posted: Fri 15/Apr/05 4:47pm Post subject: |
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| Stun wrote: | I run talc, but no parcpy little nuts.
Then again - I run Schrader... and haven't punctured in well over two years. |
I had an exhaust induced puncture early last year. 
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radical_edward
Flogged
Joined: Mar 10, 2004
Posts: 3,806
Location: The not too distant future...
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| Posted: Fri 15/Apr/05 4:49pm Post subject: |
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| Stun wrote: | I run talc, but no parcpy little nuts.
Then again - I run Schrader... and haven't punctured in well over two years. |
Hoped you just touched some wood* because you just brought down a mighty jinx on your ass....
*
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james
on your right
Joined: Feb 09, 2004
Posts: 13,694
Location: land of the long white latte
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| Posted: Fri 15/Apr/05 4:50pm Post subject: |
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| Stun wrote: | I run talc, but no parcpy little nuts.
Then again - I run Schrader... and haven't punctured in well over two years. |
I run talc, but no parcpy little nuts.
I run presta... and haven't punctured in well over two years. I ride a XC / trail bike with lightweight tubes and single ply tyres.
oh and before JB says it, Dodzy said the nuts were a waste of time as well.
and Dougal, whats the lateral force on a tyre? by lateral I mean sideways when you are hard out cornering.
Last edited by james on Fri 15/Apr/05 4:52pm; edited 1 time in total |
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Percy Pig
Mangled
Joined: May 03, 2002
Posts: 22,709
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| Posted: Fri 15/Apr/05 4:51pm Post subject: |
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They dont count.
And I dont know why but talc seems to work,I used to get pinch flats all the time untill I started using loads of talc.
Mind you even before the talc days I never ripped a stem out.
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