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My Schwalbes have been in the shop for a week and lost their pressure. Thin butyl maybe?
Don't know which tyres you have. The Ultremo HTs have latex and lose a lot of pressure within hours.. If you have one of the butyl models and it looses air within several days it could be you have a tiny pinhole defect called a "Schleicher" in German.
EdwardZ
Stern
My Schwalbes have been in the shop for a week and lost their pressure. Thin butyl maybe?