Odinson Posted November 17, 2015 Share I'm trying to do a tubeless conversion on my OEM Commencal rims. The problem I'm having is that there is a constant air leak at the valve stem. From some reading, I can figure out that it is either a leak at the base of the valve or there is air leaking into the inner rim cavity from somewhere else, which exits at the valve stem. I've put an extra piece of rim Stan's rim strip at the valve hole and fastened the nut nice and tight, but alas, no joy.The strip is also nicely installed (after a few attempts) and I can't see anywhere that the air might leak into the inner cavity. Also, there is a leak at the weld joint! Can that be patched up or should the rim be binned? I despise running tubes, so this is really damn annoying. Any advice? Link to comment Share on other sites More sharing options...
Mongoose! Posted November 17, 2015 Share Tyres used tubeless? Link to comment Share on other sites More sharing options...
Odinson Posted November 17, 2015 Share Tyres used tubeless? Yip. Tyres seat beautifully. Get them up to 2bar easily and then the air just starts coming out at the valve stem. Link to comment Share on other sites More sharing options...
Captain Fastbastard Mayhem Posted November 17, 2015 Share Superglue around the seat of the valve and the weld Link to comment Share on other sites More sharing options...
Mongoose! Posted November 17, 2015 Share Silicon spray on the valve core rubber. Unscrew the core and spray some silicon on that small rubber seal. Worked for me the last time. Link to comment Share on other sites More sharing options...
RocknRolla Posted November 17, 2015 Share I have pulled a valve through the inner rim section, because I wanted in nice and tight..so it's a bit of a balance.. also,when putting the tyre on, it could pull some of the tape away, causing air to escape. I have had similar experience...basically took the tyre off, cleaned and added another lot of rim tape. Link to comment Share on other sites More sharing options...
nonky Posted November 17, 2015 Share Yip. Tyres seat beautifully. Get them up to 2bar easily and then the air just starts coming out at the valve stem. Try a new valve. Yes, I know the leakage is at the stem but you never know. I feel your pain. I had that issue once for a whole night before a race...drove me fricking nuts. Link to comment Share on other sites More sharing options...
xcd Posted November 17, 2015 Share Get some plumbers white tape ,wrap it around the top of the valve. So that it just fits into the rim hole Link to comment Share on other sites More sharing options...
dillon Posted November 17, 2015 Share Ghetto conversion. 3 years and no trouble Link to comment Share on other sites More sharing options...
Pah Bear Posted November 17, 2015 Share Been there struggled already. Remove your rim tape and refresh. BE CAREFUL when using tire levers. That was how I managed to "damage" the rim tape and could not see the small depressions that compromised the tape seal. Thus air leaked into the inner rim and exit via the valve stem. New rim tape and Voila. Problem solved. Link to comment Share on other sites More sharing options...
dillon Posted November 17, 2015 Share Or use a tube, slice it open use it as rim tape and valve Link to comment Share on other sites More sharing options...
BarHugger Posted November 17, 2015 Share Or use a tube, slice it open use it as rim tape and valve26er tjoepie on a 29er wheel.....best of both worlds. Link to comment Share on other sites More sharing options...
TALUS Posted November 17, 2015 Share 26er tjoepie on a 29er wheel.....best of both worlds. Or use a tube, slice it open use it as rim tape and valve Been there struggled already. Remove your rim tape and refresh. BE CAREFUL when using tire levers. That was how I managed to "damage" the rim tape and could not see the small depressions that compromised the tape seal. Thus air leaked into the inner rim and exit via the valve stem. New rim tape and Voila. Problem solved.As Above. And Beer... Link to comment Share on other sites More sharing options...
BarHugger Posted November 17, 2015 Share As Above. And Beer.........the steroids of DIY...... Link to comment Share on other sites More sharing options...
Odinson Posted November 17, 2015 Share Try a new valve. Yes, I know the leakage is at the stem but you never know. I feel your pain. I had that issue once for a whole night before a race...drove me fricking nuts. Brand new valve - so definitely not the problem. It's a Schrader rim and I've got some nice Joe's Schrader tubeless valves. Link to comment Share on other sites More sharing options...
Odinson Posted November 17, 2015 Share Some more info: I haven't yet added sealant, as I first wanted to make sure I have a good seal. If I put sealant now, I'll probably just end up with a latex mess all over. Link to comment Share on other sites More sharing options...
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