I completely deserve this for saying in a recent thread that I have had no problem with setting bikes up tubeless.....anyway I removed a valve core in my road bike to put some more sealant in. The tyres kind of mega-deflated and subsequently are impossible to re-seat, except if I use the auxiliary tank thingy on my pump, without the valve core in. With the valve core in the tyres don't seat.
I can get the pump off without letting the tyre completely deflate but cannot get the valve core back in without the tyre deflating. I don't know if it's an issue with the tyres (Schwalbe Pro One) but all they seem to want to do is collapse completely when not pressurised. I cannot think of a solution (apart from taking it to my LBS) - any suggestions...?
Fill to a high pressure, pop pump off and put finger over end, then pop valve in
Thats pretty much what I have tried about a gazillion times. By the time the valve core is back in the bloody tyres have sucked themselves off the rim again! I may have to keep trying another few hundred times before then setting fire to my entire garage in rage.
Don't put your finger over the valve, it will force air bubbles into you blood and you will die😧
If the tyre will bloody stay seated then it's worth it.
Milkit Valves is the answer!
That looks a great solution, thanks!
More rim tape so the tyres ''stick' in place once per pumped up without valve?
Or milkit of course :). I gave in and got some as I just had other stuff to be getting on with and got fed up with fighting it.
Oh those Milkit valves are damn expensive but I am a convert. Don't know how well they work at road pressures but they are a lovely luxury, make checking sealant or swapping tyres almost a pleasure
On the other hand I do wonder whether the Milkit valves will be a hindrance with a tricky tubeless set up as they are going to restrict the flow of air into the tyre even with the valve core out.
Try soaking the core in vinegar and then use steel wire (eg from gear cable) to poke out any gunky sealant blocking the airflow?
I run 90 psi in my tubeless road tyres and the milKit valves seem to be able to hold that fine whilst I get the valve cores in. No sure I'd run the valve stems on thier own though with that pressure like I have done on the MTB on a few occasions.
Sometimes you get a little hiss if there's a chunk of sealant jammed in the petal valve but it still holds the air and the hiss dissapears once you've installed the valve core and pressed it quickly to clear the blockage.
Haven't noticed any difference in airflow when installing tyres with the valve core out compared to normal valves,I use a compressor so YMMV.
On my pump (joe blow) I turn the dial thing on the side to let the air out very gradually with the pump ahead attached - usually means the tyre beads stay in place. Then I just screw the valve core back in and re-inflate and they usually go up fine.
I have ordered the hell out of a set of Milkit valves! Many thanks for the excellent suggestion, which will greatly reduce my future stress levels...
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"Don’t put your finger over the valve, it will force air bubbles into you blood and you will die"
Minimum pressure to push air through healthy skin is 100psi but that's just into surface tissue, the requirement to get it into blood vessels in quantity is higher. Basically not likely to be a concern.
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Don’t put your finger over the valve, it will force air bubbles into you blood and you will die
Sauce?
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Do you reckon your tyre is seated right when you inflate it without the core? I'm a bit particular with road tubeless given the descending speeds, I'd always deflate to check it's locked on and if it isn't I wouldn't ride it.
I have those pro-ones and they are tricky customers, at least on my grail rims - v hard to seat. But when you do get em snapped on, deflate it gently and the bead should stay in place.
Sauce?
Big Daddy's 😉
Fill to a high pressure, pop pump off and put finger over end, then pop valve in
You forgot stage 5 - watch as valve core is fired across the garage, then try to work out which box/cabinet it is now under.
(well that's my version anyhow).
Sauce?
OK I made this up, I do it all the time and have to admit that I am not dead. Yet.
Northwind Subscriber
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On reflection, I should have had some of those 'div' tags around my original comment 🙂
watch as valve core is fired across the garage
I prefer my method of walking around the shed, finger over valve, wondering where I put the core when I removed it 🙂
An assistant can help, tyre to the max pressure, you have your valve core in tool right beside the valve, they pull off the inflator and you jam the valve in.
Some tubeless tyre/rim combos are so frustrating.
Daub some Copydex around the tyre bead/fim area before inflating, it acts as a kind of lubricant but if you leave the tyre inflated for a while it will have a mild gluing effect.
Update - thanks for the Milkit tip - these have now arrived and are awesome! I binned the annoying Schwalbe Pro Ones which come unseated ridiculously easily and have now gone with Specialized tubeless tyres which have behaved a whole lot better. Will be converting my MTB to Milkit valves now. What a great product - brilliant design and engineering in such a little thing.
Although I would recommend not to insert the refill device through the valve with the refill valve open and the tyre inflated....exploding syringe is the result...
Going back to the earlier comment about tyres being seated - every other tyre I have used stays on even if it loses pressure...except the f*****g Pro Ones, which literally jump off the edge if they get below a certain pressure.
That'd be why they come with a huge orange warning label stuck on the end of the syringe telling you not to do that...
But we all still do it once, with sealant as well
