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Old 07-05-20, 08:53 PM
Mad bike riding scientist
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Join Date: Nov 2004
Location: Denver, CO
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Originally Posted by dscheidt View Post
I wouldn't accept a tube that leaks 2 psi overnight on a mountain bike. On a road bike, with skinny tires at 100 psi, I'd exepect that. I run michelin airstop tubes, mostly, my bike with 700X50 tires loses about 2 psi a week (40 psi front, 50 rear). That's checked inside, so temperature isn't an issue. I would expect to be able to find a 2psi overnight leak with leak detection fluid, but maybe not in a sink.
Thatís why I said that diffusion isnít linear. A mountain bike tire at 40 psi is going to diffuse at a lower rate than the same tire at 60 psi. And the 60 psi wide tire is going to diffuse at a slower rate than narrow road bike tire at 100 psi.
Stuart Black
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