Tubeless rim valve problem
 

Stans rim with Hutchinson Fusion 3 tires. Mounted no problem. The back is holding air just fine. The front is leaking air around the tubeless valve. Remounted the tire several times but it leaks slowly around the valve. Pushed the valve in tight; even used the collar and screwed it down tight to pull the valve in as far as it would go. No observable defects in the rubber around the valve that I can see.

Not using any sealant at this point; don't plan to use any as I will be carrying an inner tube on my rides. Yes, the sealant would probably seal it up but I shouldn't have to use any. Anybody have this problem and what did you do to fix it? Thanks!

I had a bad valve seal on one of my Fulcrum wheels. You might want to get another or push the valve all the way out and try to seat it again.

Nope, that is not it; have done that several times but thanks.

I'd call Stan's tomorrow morning. I haven't used their valves, but it has to be a bad valve or something preventing a good rim/valve seal.

Tubeless without sealant makes no sense to me. Seems like you're setting yourself up for the exact situation you had with clinchers: every tiny puncture means installing a tube.

This is what I would have said.... If you really want to run dry an continue to have issues, put sealant in run them for a week or so the pull the tire remove the excess/unused sealant, replace tire you should be good.

I am with CPcyclist. If Stan's can't fix it run sealant for a week and then empty the sealant out. I am currently running my tubeless wheel w/o sealant (I have ran them both ways). Should work great.

I have seen the area around the valve stem leaking on mountain bike tubeless when the valve stem nut is tightened too tight (the nut that threads down the valve stem against the rim). The nut needs to be on there, and it needs to be snug, but you can definitely overtighten it. The rubber base of the valve stem will distort and cause a leak if it's too tight. I suspect this might be your problem.

I agree that sealant would almost certainly help, it might elimimate the problem by itself. FWIW, I've used Stan's tubeless on mountain bikes for about ten years, and have recently built myself some road wheels using Stan's rims, and am running Hutchinson Atom road tubeless tires on them. Loving the ride quality, and don't expect to have any flats with road tubeless, just like with mountain tubeless, unless I tear a good sized hole in the tire. I wouldn't even consider tubeless without Stan's sealant........But to each their own, of course.