Our Michelin A1 tubes lose about 1 bar (15 psi) per week. And that has been the case for the decade or so that we have been using them as our preferred inner tube. YMMVrubbersoul said:Suck! Go flat within 3 days after being pumped up. Switched to Continental..perfect, no deflation through osmosis.
Not a process of osmosis as I’m pretty sure you don’t have water entering your tubes but rather oxygen migrating (permeating) faster out of your Michelin tubes as you suspected...yes?rubbersoul said:... no deflation through osmosis.