Hello, I bought new tubeless valves and have fitted the tyre and everything fine, but the valve is leaking air and I can't even make it 100 meters before the tyre is flat again.
If I give the rubber o ring a poke with my thumb nail it seems to stem the flow of air
Does anyone know how I can fix this?
by ImpatientSquirrel
10 Comments
Did u try tightening some more? I had a similar problem and switched to Stan’s.
You may just need to retape the rim.
When is the last time you added sealant? has it been more than 6 months?
Most likely Your rim tape is failed at some point and airs leaking into the rim and out your valve stem area.
Tightening the valve will not help.
Pull the tire off , take off the valve stem, redo your tape .
Reinstall the valve stem . Add new sealant.
If it still leaks then the o ring or valve stem has some failure. Rare but it can happen.
Just spin and shake around the sealant in the tyre and it will seal.
Good chance it s the tape. Had the same issue lately.
Your tabe could be perfect and still get leaks at the valve, sometimes the tape at the around the vale area is to tick or messed up and the valve don’t sit correctly, specially if you make the tape overlap at the valve side and not the opposite side, sometime the valve itself don’t sit right and sometimes the sealant will fix that, but, when you inflate the tyre again it may move the valve and start leaking again.
Usually if there is problem with the tape on other parts of the rim you will have leaks at the spokes too and not just the valve
I had more lucky with valves like Stan, with the conical shape, so a little bit of the rubber gets inside the hole and a more rigid rubber, those with silicone type that are soft always had problems with that.
Now I only use Stan or Slime that are available at my region.
My wheel is asymmetrical and it’s a pain to make the valve sit right because the o-ring don’t do its job right.
I personally never put the sealant before all the leaks are fixed, sometimes even ride without it, it’s to messy to work after.
Assuming your tape job is fine….
Before installing stems, take the end bottom/end and dunk it in sealant.
it’s the tape. it’s always the tape. you may have over or under-tightened the valve nut, but it’s always the tape. unless your bead is fucked. but it’s the tape
I had this exact issue and it was the tape. I had a shop redo the tape for me to make sure it was on correctly and all is good again. Thankfully it happened at home so it didn’t leave me stranded.