I replace my Conti 2.6 tubeless tires with Conti 2.1's. My front wheel would then always deflate every 2-3 days or so. I removed the tire and checked the rim but I can find no evidence of rim damage or any sign of damage to the tire. So I switched back to the original which I'd been using for 2 years. Tonight, barely 40 minutes after pumping it up to 50psi, it was flat! Two tires with the same problem? Unlikely perhaps. All I can think of is that the value is at fault and I'm willing to replace it.
Do you think it is likely the cause of my trouble?
If so, can I replace the valve and is there a particular size I need to ask for or is one-size-fits-all? My rims are Mavic 3.1 UST tubeless by the way. Is it possible to overhaul the valve or reseat it, and if so, would I need to use any form of sealent?