Inflating presta tubeless tyres with the valve core removed - how?

[Bobbo_SA]

Those little plastic core removal tools makes it a breeze to screw the core in and out. And it is so small and light, you can keep one everywhere you might need it, tool kit, tool box, garage and car.

 

I use my spoke tool, also works well

[Brian Fantana]

The valve core I have with the shaft thing/with lock nut removed works a charm , just tried it now.

 

So I still want to know how people are using CO2 bombs with the valve core removed or at a petrol station where you need to use a shrader adaptor??

 

Easy.

 

At home I just press my pump nozzle (on presta setting) over the entire valve and inflate until the tyre bead sets. Then I remove pump nozzle, press my finger on valve opening, and then quickly screw the valve core in, and tighten with valve core tool.

 

At a service station, I unscrew the nozzle on the air gun and press the pipe over the presta valve with removed core and inflate. Once again, remove air source, seal hole with finger, install core again. After this I use the presta/schräder adaptor and inflate to the desired pressure with the air gun's nozzle in place.

[johannrissik]

Once you have removed the valve core from a removable core Presta valve, just use the Schraeder-Presta adaptor as if the valve core were still there.

Hold it tight against the valve and let fly with the compressor. This method requires two hands (one on the adaptor and one pushing the button on the air hose.

 

Oh, no compressor?

Get your buddy to pump that track pump at 500rpm while you hold it in place.

 

Note: You won't easily get the adaptor to sit on the valve without messing something up, you must hold it in place.

 

Ride over the mountain and I'll show you.......or maybe not in this heat

[Skylark]

Ok so Heath Robinson maak n plan techniques!

So tell me now, when using a CO2 bomb that will freeze your hand to the valve stem, how do you press the adaptor onto the valve stem?

[Brian Fantana]

Ok so Heath Robinson maak n plan techniques!

So tell me now, when using a CO2 bomb that will freeze your hand to the valve stem, how do you press the adaptor onto the valve stem?

 

Why would you want to use a CO2 bomb with the core removed? Most of the time a serivce sation compressor or bomb have enough flow to set a tyre on the bead without removing the core, especially if you have soapy water on the bead.

 

However with a floor pump the removal of the valve core is important.

 

Edit: CO2 bombs are meant for trail-side repairs, I fail to see why you need to remove your valve core on the trail? In 8 years of riding tubeless I have only removed the core when topping up sealant or when repalcing a tyre.

Edited January 16, 2014 by Brian Fantana

[V12man]

Well, here is an opportunity for a new product

 

My adapter screws on to the valve stem just fine - you just have to look for one that does - alternately be handy with a tap and die set.

[Skylark]

Why would you want to use a CO2 bomb with the core removed? Most of the time a serivce sation compressor or bomb have enough flow to set a tyre on the bead without removing the core, especially if you have soapy water on the bead.

 

However with a floor pump the removal of the valve core is important.

 

Edit: CO2 bombs are meant for trail-side repairs, I fail to see why you need to remove your valve core on the trail? In 8 years of riding tubeless I have only removed the core when topping up sealant or when repalcing a tyre.

 

That's what numerous people recommend if you burp your tire and need to set your bead next to the trail with CO2, preferably with the valve removed to maximise flow and the chance of reseating the bead.

 

But anyway my valve core body without the lock shaft thing solves the issue, I now have one in my saddle bag

Edited January 16, 2014 by Skylark

[rouxtjie]

My adapter screws on to the valve stem just fine - you just have to look for one that does - alternately be handy with a tap and die set.

what he said....mine screws in fine...oh and on the bare hand thing...wrap bombs in ducttape and wear full fingers....sorted.

 

When you are taking the core out, you do it to create massive quick flow....to save some air on the side leaking out isn't the goal...you are trying to get MOST of the air in there are as QUICK as possible...not ALL the air slowly.

[Skylark]

My adapter screws on to the valve stem just fine - you just have to look for one that does - alternately be handy with a tap and die set.

 

You sure sure?

I have tried 3 different shrader to presta adaptors and they all only screw onto the valve core and on all of them the o-ring inside at the back of the threads seats against the lip of the valve stem - so they are never going to screw onto the stem. My CO2 bomb adaptor also works like that.

[rouxtjie]

Why would you want to use a CO2 bomb with the core removed? Most of the time a serivce sation compressor or bomb have enough flow to set a tyre on the bead without removing the core, especially if you have soapy water on the bead.

 

However with a floor pump the removal of the valve core is important.

 

Edit: CO2 bombs are meant for trail-side repairs, I fail to see why you need to remove your valve core on the trail? In 8 years of riding tubeless I have only removed the core when topping up sealant or when repalcing a tyre.

Some TR tyres and rim combo's need more air to seat...and it needs it quick. The goal is to get most of the air in there as quick as possible...by removing the core, you are allowing better flow and some TR refuse to bead any other way with a bomb

[rouxtjie]

You sure sure?

I have tried 3 different shrader to presta adaptors and they all only screw onto the valve core and on all of them the o-ring inside at the back of the threads seats against the lip of the valve stem - so they are never going to screw onto the stem. My CO2 bomb adaptor also works like that.

Mine works like that too...screws onto the valve stem with core removed...he is right

[MTBc]

 

But how exactly do you do this?

Do you keep a spare valve handy with the valve core permanently removed because removing the valve core is not very easy and often damages the valve and writes it off.

 

I find it pretty easy, I remove the core about once a month to top up sealant (I get a lot of punctures ). The chain breaker section on my multitool fits around the core, not sure if it was designed to do this or just chance (the core has 2 flat sides).

[johannrissik]

You sure sure?

I have tried 3 different shrader to presta adaptors and they all only screw onto the valve core and on all of them the o-ring inside at the back of the threads seats against the lip of the valve stem - so they are never going to screw onto the stem. My CO2 bomb adaptor also works like that.

Some of the adaptors screw onto the Presta valve stem, but not all.

That's why I said push it on.

Jinne man, Skylark, should I go and scratch one out of my workshop that does screw onto the valve stem and post it to you? Or will you just meet me at the top of the Pass?

[V12man]

You sure sure?

I have tried 3 different shrader to presta adaptors and they all only screw onto the valve core and on all of them the o-ring inside at the back of the threads seats against the lip of the valve stem - so they are never going to screw onto the stem. My CO2 bomb adaptor also works like that.

 

Sure I am sure....works for me...

 

Just modify one if you can't find one that works - can't be that difficult to find a tap that matches the thread on the stem.

[Brian Fantana]

Some TR tyres and rim combo's need more air to seat...and it needs it quick. The goal is to get most of the air in there as quick as possible...by removing the core, you are allowing better flow and some TR refuse to bead any other way with a bomb

 

Cool, I understand that, but my main question was why you would need to seat a tyre on the trail? Even when a tyre burps, it remains seated in most cases, it doesn't pop of the rim completely. After most tyre burps you just need to inflate to the desired pressure again.

 

But I understand that some TR tyres don't sit that tight on certain rims, and that you need a high flow rate to seat them, and that requires the core to be removed.

[Brian Fantana]

OK, so last night I checked, and discovered the following:

 

- One of my 3 Presta ---> Schrader adaptors can screw onto the valve stem with the core removed - Problem Solved

 

- My Genuine Innovations bomb adaptor can fint onto Presta, Presta with core removed and Schrader valves. It has two different size O-rings inside, with the larger one on the edge, and the smaller one a bit deeper. You just squeeze it over the valve until you can feel the O-ring have squeezed over the valve - Proble Solved

 

Bottom line: The products that Skylark requires are out there, you just need to find them.