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valve extenders and co2 cartridge?

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valve extenders and co2 cartridge?

Old 07-03-15, 04:48 PM
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spectastic
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valve extenders and co2 cartridge?

I'm thinking about committing to carbon wheels for both training and racing for both of my road bikes. My plan is to get 38f/50r for my training set and 60f/60r for racing. so obviously, I will need 80mm inner tubes. But all of my existing tubes are ~50, and will require a valve extender. I'm wondering if anyone has experience using co2 cartridges with a valve extender. I feel like the junction between the valve stem and the extender will have a great propensity of leakage, and the sudden temperature drop might pose an issue as well.

any advice?


PS. when I say valve extender, I mean the kind that goes on the stem without removing the valve core and reinforcing the joint with teflon tape. I mean the type of extender that just screws on top of the valve, with the screw open

Last edited by spectastic; 07-03-15 at 04:52 PM.
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Old 07-03-15, 05:12 PM
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I tried it once and lost a lot where the co2 head goes over the extender. I just switched to 80mm tubes snd never had a problem after that.
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Old 07-05-15, 02:17 AM
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Old 07-05-15, 03:35 AM
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I'd forego the adapters and go with new tubes. The little bit of money saved isn't worth the hassle. I've got two sets of carbon tubulars...and I fargin' hate those adapters.
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Old 07-05-15, 05:34 AM
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New tubes with long stems or tubes with removable cores and extenders are the way to go. Also, don't forget to check your spare, and test it in your rims! I remember one time when I had a flat, didn't test the extender on my spare, and the diameter of the extender was too large to fit in the hole of the rim. My wife wasn't too happy to drive out 40 minutes to the middle of nowhere, OH to pick me up. I walked to an ice cream shop to wait for her, so it was all good.
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Old 07-05-15, 07:03 AM
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Yeah. I use long stems and carry a spare tube with a long stem, but also carry an extender with me should I wind up needing to borrow a tube from another rider.
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Old 07-05-15, 07:10 AM
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Originally Posted by Silvercivic27 View Post
New tubes with long stems or tubes with removable cores and extenders are the way to go. Also, don't forget to check your spare, and test it in your rims! I remember one time when I had a flat, didn't test the extender on my spare, and the diameter of the extender was too large to fit in the hole of the rim. My wife wasn't too happy to drive out 40 minutes to the middle of nowhere, OH to pick me up. I walked to an ice cream shop to wait for her, so it was all good.
Just wondering why you couldn't remove the extender and reattach it after pushing the original stem through the hole. I'm guessing you didn't have the little wrench and some Teflon tape with you. If that is so, I think it makes a case for carrying the spare tubes with their original valve core installed or using non-removable-core tubes for spares. Then in either situation the simpler extender that doesn't involve a valve does the trick, certainly well enough to finish out your ride.
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Old 07-05-15, 07:24 AM
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Depth of the rim was such that the extender would have to be at the level of the hole in the rim. Original stem on the tube was too short. Nowadays I just carry an 80mm tube for a spare for most wheels, but for 80mm + deep rears, you still need an extender.
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Old 07-05-15, 07:56 AM
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Originally Posted by Silvercivic27 View Post
Depth of the rim was such that the extender would have to be at the level of the hole in the rim. Original stem on the tube was too short. Nowadays I just carry an 80mm tube for a spare for most wheels, but for 80mm + deep rears, you still need an extender.
Ah, so the extender wasn't just outside the rim. I get it.
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Old 07-05-15, 07:59 AM
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Prior to that experience I never thought the diameter of the extender would be an issue.
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Old 07-05-15, 09:11 AM
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Originally Posted by Silvercivic27 View Post
Prior to that experience I never thought the diameter of the extender would be an issue.
Yeah, I know. But you can drill out the hole a smidge. No harm, no foul.
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Old 07-05-15, 09:29 AM
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If in doubt buy tubes with a long 1 piece P/V stem.
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Old 07-05-15, 11:38 AM
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Originally Posted by rpenmanparker View Post
Yeah, I know. But you can drill out the hole a smidge. No harm, no foul.
I definitely ain't drillin out Zipp 303 Firecrests, lol. I'll find a new $2 valve stem or a new adapter.
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Old 07-05-15, 11:46 AM
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Originally Posted by Silvercivic27 View Post
I definitely ain't drillin out Zipp 303 Firecrests, lol. I'll find a new $2 valve stem or a new adapter.
I hear you and appreciate your reluctance, but it isn't rocket surgery. Sometimes you just need to ask yourself, what would Sheldon Brown have done?
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Old 07-05-15, 12:32 PM
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Whatever Sheldon might have done, it wouldn't have included riding Zipp 303s!
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Old 07-05-15, 02:21 PM
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Originally Posted by revchuck View Post
Whatever Sheldon might have done, it wouldn't have included riding Zipp 303s!
No, but I bet he would have drilled them!
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Old 07-05-15, 04:20 PM
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Originally Posted by rpenmanparker View Post
No, but I bet he would have drilled them!
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Old 07-05-15, 06:53 PM
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I sell and stock removable valve core tubes now for just this reason. Then we just use and sell the extensions that allow you to move the valve out to the end. That and 80mm tubes. Just the right way to do everything.
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Old 07-06-15, 09:03 AM
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so I should put my drill away?
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