Hi, Does anyone know of inner tube Shrader valve cores that do not leak air? Seems most cores leak air to a small degree, as I have to pump my tires every ride. Just wondering if there are cores on the market that are best at holding the air. Thanks!
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Well, I can't say a 100% that it's the cores. I can only tell by the pressure loss overnight and after rides. It seems the mostly likely culprit considering I can't find leaks on the tube itself. (Using the bubble test). I've tried tightening the cores by screwing them in as best they'll go.
MTB tires and tubes are microscopically porous and will leak air when sitting around for a period of time. There's no special coating inside(like car tires) that minimize or prevent air loss.
Until bike tire manufacturers decide to put a coating inside the tires to prevent or minimize air loss, you'll just have to check your pressures regularly.
Until bike tire manufacturers decide to put a coating inside the tires to prevent or minimize air loss, you'll just have to check your pressures regularly.
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The bubble test should reveal leaks at the valve core too. Try overinflating the tube until it's 2 or 3 times it's normal diameter before immersing it in water to reveal small leaks.
Also tubes are permeable so they all leak to some degree, especially in high pressure tires
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I have a bunch I can sell you. Although they look like regular valve cores, they are different and will hold air better. Will sell you 1 for $10 and 3 for $25.
I also have a special pump that will fill your tires with 78.09% nitrogen. $125+ shipping.
I also have a special pump that will fill your tires with 78.09% nitrogen. $125+ shipping.
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Remove your cores and make sure there's no dirt on the seals. Beyond that, no valve core, presta or shrader, is going to seal significantly better than another.
A tube should hold about the same pressure for days or weeks, depending on the outside temperature. If your tubes are leaking more than that, there's probably a hole somewhere. You can also squirt a little sealant like Orange Seal or Stan's in the tube to seal up small holes.
A tube should hold about the same pressure for days or weeks, depending on the outside temperature. If your tubes are leaking more than that, there's probably a hole somewhere. You can also squirt a little sealant like Orange Seal or Stan's in the tube to seal up small holes.
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Why are you screwing in the valve core on a Shrader valve?
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To tighten them?
gonna guess it's because they are screw threaded and screw in and out ?
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My road tubes leak 2-4 psi/day. That's high pressure compared mtb tires so are gonna lose pressure faster. I don't remember how fast my tube mtb tires would leak down, but my tubeless tires leak down at least a couple psi/day. I always air up my tires before a day's riding, mtb or road, even if it's only been one day.
It's not the valves. Air diffuses through the rubber. CO2 diffuses more quickly than air.
It's not the valves. Air diffuses through the rubber. CO2 diffuses more quickly than air.
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This thread has win throughout. Like a fine wine it should only get better with time.
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Schrader? Put the valve cap on with some teflon tape or pipe joint compound. :idea: :crazy:
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haha good one!
To be clear, I meant to ask why OP is actually having to mess with the core.
I suppose OP is doing that because "its leaking" and therefore probably needs tightened.
I don't remember (personally) having to remove/install a Shrader valve core on a tubed tire.
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They can leak, especially if there's sealant in the tube. Long ago I worked at a shop where the owner had us remove, oil, and reinstall the valve cores on every tube we installed.
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That sounds horrible! Sometimes they do need reinstalled, but on every tube seems a little excessive.
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