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Setting up my new wheels with the supplied valves and they are leaking .
Have tried more tape, another valve and a bit of tyre wall between valve and rim.
Admittedly I don’t have any sealant in there but I would have thought it shouldn’t need it.
<span style="font-size: 0.8rem;">. Any other ideas?</span>
Not had this problem before.
I had this problem with my fatbike. The valves wouldn't seal with the single wall rims. I installed some Super P-nuts and that fixed it.
Never seen those. Shall give them a go.
... and if not a single walled rim ... Air almost always escapes from the valve hole if it's a rim with an internal void - that's just the biggest outlet for it
Check your taping carefully
That said, I also used to put a bit of bathroom mastic sealant around the valve seat on "round" valves - 'til I started using DT Swiss valves. I find that barrel shape gives a much better seal without exerting a big force on the valve (I once pulled a valve right through the hole and it was presta-drilled, not a Schraeder hole)
I always use sealant - it could be that there's a small airgap around the valve hole. Pop some sealant in, pop the valve facing the floor, then quickly flip it so it's facing the ceiling.
That'll coat the valve hole.
The other thing it could be is the rim weld. Often they're not air tight, does you tape cover the entire weld? If not, make sure it does.
I stick a small O ring on the valve stem which seems to solve the leaking problems.
I tend to really tighten the valve stems into the rim to the extent of pushing the valve down hard into the rim whilst tightening the valve lockring, even using pliers for a better grip on the lockring
Yeah they usually come with an o-ring. Did you fit one under the nut?
I installed some Super P-nuts and that fixed it.
This worked for me too.
More likely to be taping, it just shows at the valve, every time.
Sealant will sort that out .
I was given a tin of tyre cement by a friend who worked for ATS.I dip the valve in the cement then fit it to the rim after it has started to become sticky.
A couple of weeks ago i damaged a sidewall and had to pump the tyre up a few times to get home and in doing so realised that the valve nut wasn't really tight though remained leak free.
The reason i started down this road some years ago was because of similar probs to the OP.
I always use a liberal blob of wood/latex glue around the rubber valve base. Maybe you shouldn't need it, but why make things hard for yourself?
Bit of scrap inner tube between the valve and the rim has worked for me.
+1 for scrap inner tube.