I’ve got a Stans Podium MMX rim which I’m using with tubeless 559×28 slicks. I’ve replaced the tyre, and because the sealant makes a bit of a mess when I take the old tyre off, I removed the tape and valve, cleaned the rim, replaced the tape with new tape, and fitted a new Stans Presta valve. I was able to fit the tyre to the rim and seal it using a compressor. It sat for a few hours without sealant, and was relatively air tight. I added the sealant, and shook it around. It seemed to stay pumped up for a few hours, although it was flat the next day. I’ve given it a few more pumps and shakes, but didn’t have a chance to fit it on the bike.
However, now it seems to be leaking from the base of the valve. It’s difficult to get air into the tyre, and when it does it escapes after a few seconds. If I shake the tyre when there is still air in it, sealant squirts out from the valve area. I noticed when I removed the old valve that there was a lot of dried-up sealant around its base.
I tightened the knurled nut ‘finger-tight’ as instructed in the Stans instructions. I’m not sure how tight that is, but I nipped it up pretty tight with my fingers. When I made the hole through the tape for the valve I used a bradawl which was smaller in diameter than the valve stem.
Is there anything I can do to fix this? I’m hoping the rim isn’t damaged.