Originally Posted by
Troul
your luck might have changed & that pesky slow leak could just be needing a little more snug of the presta valve body going thru the wheel cavity.
Also running it a bit sometimes is required. That or using a little more sealant than recommended. Losing 10 psi overnight is kind of minimal and likely to be resolved with a good ride to get it well seated. I typically ride them as soon as they are installed. When I don't they have often leaked a little bit until I do put a few miles on them.