Schrader fitting, for setting tubeless tires (small & motorcycle etc)

[dfkrug]

Definitely need to pull the core out! Thx for the link to Gemplers.

I think this is the item I need. As far as I can tell, it has no internal shutoff, requires a valve upstream,
so I'm assuming it's purpose is full-flow. I'll run a larger hose out of the ball valve, then reduced down
at the air chuck.

View attachment 412982

That's an interesting fitting which I have not seen before.

But there is an easier way, if I understand what you are doing: just take a QA fitting
and tap the pipe-thread end to the Shrader valve thread. This is an unusual thread
size, 5/16-32, so you will have to order it. About $7.

Now you can remove the valve in your stem, thread this new fitting onto the stem,
connect up your hose to the fitting, and let-er rip.

I do this without a quick-dump tank like you have. I just open the ball valve at
my compressor, which allows me to stand way back from the tire I am filling.

I do ATV tires, and it can be dramatic, requiring quite a bit of flow and pressure
to get these tough tires to fully seat.

 

[Sodo]

The reason I am doing this is that working on my property I've had several tires come off the rim, for mainly ATV, and ATV trailer. I would like to have a lightweight quick-dump tank thats easy to carry to where the tire problem is and set the bead right there. And then I use my little 12v compressor to get the pressure I need. Other times for changing a tubeless motorcycle tire, it's often someplace away from my shop air. Other times it's a rescue mission where I have to carry the tank to help someone. This is a low cost test; to see how small a tank can "do it".

Interesting idea tapping to schrader thread, thx for that note (5/16-32). But seems like you'd have to drill (or "have") a fairly accurate (9/32) hole to tap a 32 thread.

I actually don't think threads are necessary, just a rubber squeeze clamping force is probably sufficient. Kinda prefer NOT to screw on, because it can be too slow and leaky coming off. Sometimes you can remove the filler hose, and quickly insert a valve core and catch quite a few psi remaining.

 

[bcp]

Have you thought of this method?

Bead seater tank

Bruce

 

[Sodo]

Yup Bruce you always deliver. That's the way to do it, I'm done researching this method, will build one of those……

 

[bcp]

Interesting idea tapping to schrader thread, thx for that note (5/16-32). But seems like you'd have to drill (or "have") a fairly accurate (9/32) hole to tap a 32 thread.

Just solder a metal valve cap to a piece of common size fitting or pipe nipple.

Bruce

 

[dfkrug]

The reason I am doing this is that working on my property I've had several tires come off the rim, for mainly ATV, and ATV trailer. I would like to have a lightweight quick-dump tank thats easy to carry to where the tire problem is and set the bead right there. And then I use my little 12v compressor to get the pressure I need. Other times for changing a tubeless motorcycle tire, it's often someplace away from my shop air. Other times it's a rescue mission where I have to carry the tank to help someone. This is a low cost test; to see how small a tank can "do it".

Interesting idea tapping to schrader thread, thx for that note (5/16-32). But seems like you'd have to drill (or "have") a fairly accurate (9/32) hole to tap a 32 thread.

I actually don't think threads are necessary, just a rubber squeeze clamping force is probably sufficient. Kinda prefer NOT to screw on, because it can be too slow and leaky coming off. Sometimes you can remove the filler hose, and quickly insert a valve core and catch quite a few psi remaining.

Yeah, portability is good for your application.

The QA air fittings are almost the right size to be tapped without drilling. I used the right drill size first,
tapped it, then I was ready to go in about 10-15 minutes. Works great.

A rubber clamp style schrader hose would work if it did not have the obstruction inside that pushes on
the valve. I have a few of those from 12v compressors. I wanted maximum flow.

I also considered attaching a pipe nipple and some fittings to a metal valve cap. That seemed more work than
just the tapping of one hole.

 

[Xfaxman]

You also need a jack or some other way to get the weight off of the tire.

 

[prs]

Sodo, is it your intent to set beads away from a main compressor? I set my tubeless motorcycle tires with a regular chuck from my compressor and with 3.5 gallon tank. I have the Schrader core removed and use a common press on female chuck. I set my limit pressure to 55#. I use a glycerin soap base and water mix as a lube and just enough to make beads and seats uniformly damp. When I hit the wheel/tire with the air I get the two tell-tale LOUD bangs of a well seated bead and that damp lube is like a glue when it dries. I have learned on secret to assure quick bead seating with this set-up. Once the beads and seats are dampened, pick the tire up about 3 feet and let it drop onto the center of the tread, rotate about 30 degrees and repeat; repeat several time. This taps the beads up close to each seat and prevents losing so much of that initial air blast. This works great on those really tough GL1800 rear tires they are probably the toughest around un less you are a run-flat Darksider (works on those too ;-)

prs

 

[Sodo]

back on post #12

The reason I am doing this is that working on my property I've had several tires come off the rim, for mainly ATV, and ATV trailer. I would like to have a lightweight quick-dump tank thats easy to carry to where the tire problem is and set the bead right there. And then I use my little 12v compressor to get the pressure I need. Other times for changing a tubeless motorcycle tire, it's often someplace away from my shop air. Other times it's a rescue mission where I have to carry the tank to help someone. This is a low cost test; to see how small a tank can "do it".

With wheel off I will thump it around a few times, but the most reliable method us to use a ratchet strap around the circumference of the tire to squeeze the beads outward.

But I'm hoping this way is faster or easier or both. I think I'll try the flattened-tube ram-air method, maybe can have both options on one tank.

 

[prs]

And, if all else fails?

https://www.youtube.com/watch?v=GmMsBSbFq-g

prs