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Barberi Carbonaria valved from On-One/Planet X - I just cannot get them to seal. They are the type with a rigid valve stem with a separate slide-on rubbery seal. This doesn't seal and seems to distort, making the chances of sealing non existent. I Have tried them on some Roval rims and some Sun Ringle rims, same outcome.
I have achieved a seal, but only after adding a good few wraps of PTFE tape, and this is an annoying bodge. I can get a good seal with standard valves, but these get "blocked" by the foam inserts meaning I can pump the tyre up, but not release pressure easily.
I don't know whether I am looking for advice or sympathy, but I am certainly frustrated. Getting the tyre on and off with the insert in is a wrestle, and then to find the valve does not seal against the rim is infuriating. I now have two bikes with uninflated rear tyres, and sealant cover hand/keyboard...
This sounds more like a sealant problem as most will at least seal a hole upto 5mm.
OK the valves might not be doing the best of jobs but they should still seal.
What sealant are you using and is it mixed properly and used straight away, like in seconds not minutes.
That cone shape type of valve needs to go half way into the hole ideally, at which point as you screw the valve on tighter it compresses the cone and fills the gaps - If the hole is too small for the bung they can be a bit crap. Try using just an oring or two instead in that case. As long as you can compress the o-ring over the hole it will seal.
What’s the foam insert for?
I have those valves too, on my Hunt rims with the conical seal they work fine, on a wider set of Nextie rims they leak no matter which red bit I use. Ditching the inserts now because I don't get on with them and will go back to regular valves.
Have you heard of these wonderful things that you put in the tyre and fill with air. They have integrated valves and negate the need for sealant.
"Inner Tubes" I think they're called...
“Inner Tubes” I think they’re called
Yeah, we used em in the 90s along with v-brakes and 130mm stems. All were shit.
Inner tubes don’t work with tyre inserts
I gave up with those valves, the threads seemed really shoddy.
I can't remember where I learned this but I was told to use a healthy dob of thick grease around the valve seat when assembling a tubeless setup.
I've done this on every set and have never had a problem with sealant or air leaking around the valve. Just put the grease on before inserting into the rim.
Initially I wasn't sure but as it has been proved to work, I'll keep doing it. I guess it helps the valve to seat properly in the rim, the thick grease doesnt disappear and the sealant seems not to be affected by it.
However it works, might be worth a shot.
Thanks for the advice. I will have another go tonight.