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Why do tubulars lose air?

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Why do tubulars lose air?

Old 05-02-21, 10:32 PM
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Mark Dominck
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Why do tubulars lose air?

I love my tubulars and I don't even mind pumping them up before each ride but it puzzles me as to why?
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Old 05-02-21, 11:09 PM
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Originally Posted by Mark Dominck View Post
I love my tubulars and I don't even mind pumping them up before each ride but it puzzles me as to why?
The materials that tires and tubes are made out of are somewhat permeable to air, which is to say, air can leak through them. Inner tubes made from latex rubber tend to be suppler and have less rolling resistance than the more common inner tubes made from butyl rubber, but latex rubber is more air-permeable than butyl, so tires set up with latex inner tubes tend to bleed pressure much more quickly.

Most performance-oriented tubulars use latex inner tubes, resulting in fairly quick loss of pressure. (You can get latex inner tubes for clinchers as well, and this similarly results in faster pressure loss than if you use standard butyl tubes.)
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Old 05-02-21, 11:46 PM
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Air is not very clever, but latex is easy to trick.
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Old 05-03-21, 04:52 AM
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Another advantage to latex is they tend to flat less due to the suppleness.
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Old 05-03-21, 08:17 AM
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If the rubber were thick enough and made with stuff to make it harder for air to pass through it, then you'd be riding something about the size of your car tire. Do you really want that much weight on your bike?

All tires clinchers, tubeless and tubular let a little air pass through their thin material. Till technology gets a cheap enough fix for that, we have to put up with it if we want something comfortable enough to ride.
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Old 05-03-21, 08:42 AM
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Mark Dominck
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Thanks you guys took care of that question,just the way it is.
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Old 05-03-21, 08:45 AM
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As has been stated, Latex tubes' structure (physical properties) are much more permeable than vulcanized/butyl tubes. They leak air at a higher rate. It's a trade-off. They deflated faster but provide better road feel, better cornering and handling than standard rubber tubes and clinchers.

FWIW, I run "Open Tubular" tires (Challenge Strada Biancas) with latex tubes. I find the ride almost the same as traditional tubular tires with the convenience of clinchers. And yes, they leak air fairly rapidly and need to be topped off before every ride.
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Old 05-03-21, 10:21 AM
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Originally Posted by Darth Lefty View Post
Air is not very clever, but latex is easy to trick.
yet we rely on a barrier contraception made from that material to prevent 18 years of bad luck.
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