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I don't have them at 90PSI by the way. I just wrote that so people knew the limit.
I tend to get a fair amount on other bikes. All running tubes. Cheap tubes maybe?!
Tomo187-
Think it really depends on the rubber compound. Those Clement XPlors lost a lot of air when I first set them up tubeless (they aren't supposed to be used tubeless), added some more stans fluid and after a week or so, they stopped losing air. Quite a few bubbles on the sidewalls where the fluid had been seeping through.
turnpedal
The rating is a limit, not a guide. 90PSI sounds bloody uncomfortable for days in the saddle. I don't find I get much pressure loss unless it's over months, but that's probably cos i run them tubeless.