Resealing flat tyre on tubeless rim

[Mintman]

It's pretty pathetic that I don't know how to do this by now but I'd really appreciate some pointers.

 

I have an XC bike that had a tubeless conversion done to the stock standard Jalco XCD22 rims. I was going down a steep decent the other day and when i came up the other side the rear wheel burped (?) and completely lost all air.

 

I tried pumping it back up vigorously with my floor pump to no avail. So my question is simple: how do you reseal the tyre's bead in this situation where it's completely flat?

 

I'll need to get some more sealant as it blasted out a lot. I'm just wondering how i go about resealing it so the new sealant (and air) doesn't just come out.

[BaGearA]

The bead of the tyre needs to "pop" into place 

 

Go to a garage and use their compressor , you'll know when they're on properly 

[Vetseun]

I use the following method. I have a compressor but you can use you local filling stations if you dont have one.

Remove the valve core.

Give it a blast of air, it will pop into place with a bang. Gently allow it to deflate.

Then top up the sealant with a syringe through the valve tube. I use a big syringe that I got at Dischem. It takes a red cup of stans.

Refit the valve core and inflate.

Give it a spin to distribute the Stans.

When you get home, you can fine tune the tyre pressure using your floor pump.

[thisismyotherbike]

It's pretty pathetic that I don't know how to do this by now but I'd really appreciate some pointers.

 

I have an XC bike that had a tubeless conversion done to the stock standard Jalco XCD22 rims. I was going down a steep decent the other day and when i came up the other side the rear wheel burped (?) and completely lost all air.

 

I tried pumping it back up vigorously with my floor pump to no avail. So my question is simple: how do you reseal the tyre's bead in this situation where it's completely flat?

 

I'll need to get some more sealant as it blasted out a lot. I'm just wondering how i go about resealing it so the new sealant (and air) doesn't just come out.

I use a floor pump that features an overdrive tank. Basically you pump lots of air into the tank, connect to your valve and release all that pressure to seat the tyre.

 

Works a charm and lots cheaper than a compressor.

[Guest]

I'd recommend when out on the trail is to use a CO2 bomb. 

If it means to just get you home.

[FrikkieMeyer87]

Just for the technical background to what you're experiencing real quick:

 

For a tire to inflate, the internal pressure needs to exceed that of the ambient pressure. We obviously achieve this by adding air using a pump of sorts. When using a tube or previously seated tubeless tire, this is easy to do because the rate at which you add air only affects the time it will take to get up to the pressure you want to achieve, seeing as regardless of how little air you add, it will remain in the tube or tire.

 

When a tubeless tire becomes unseated, it forms a gap through which air can escape. Suddenly the rate at which you add air while inflating it (or attempting to do so) becomes rather significant, seeing as you now need to add air at a rate higher than that at which it's escaping through the breach. Your average hand- or floor pump generally does not possess the ability to add air at this rate, which is why you'll pump till the cows come home to no avail.

 

There are a few ways of seating a tubeless tire, but all require a burst of high-volume, high-pressure air the likes of which are gotten from:

 

a) A compressor

b) A CO2 bomb

c) A charge tank / overdrive tank / etc.

 

You typically do not want residual CO2 in a tire that you'll be filling with sealant, but you may find that you can use a CO2 bomb to seat it at home, then inflate and deflate it a couple of times with your floor/hand pump to get all the CO2 out, taking special care not to let it unseat, then finally chucking in ye olde sealand and giving it a final pump & spin to allow the sealant to fill all the little gaps which might still exist. Remember to wipe down both the rim and the tire bead BEFORE doing all this to save yourself some slow-leak frustration later on. The better the seat, the more dependable the final solution will ultimately be.

 

Good luck!

[Mintman]

Thanks a lot guys! Really helpful feedback

[solty]

If you go to the petrol station to use their pump, Vetseun method, just remember to take along a valve adaptor. Little brass thing which bikeshop should have, screws onto your bike's valve and makes it "wider" bigger diameter, so the compressor fits on snuggly.

Also, some petrol stations have fancy tyre pumps where you dial in the pressure before you give it air. These don't work so good.

 

While you're inflating it can help to push on the tyre tread to encourage it to move outwards towards the rim, especially if the tyre has folds.

[Pure Savage]

Wait, nobody has suggested a little bit of lighter fluid and a match, the resultant little explosion will cause the air to expand and seat the tire to the rim. This will also then remove the source of oxygen so the flame will die. 

 

A little ghetto, probably not the best with carbon rims and cotton side walls. 

 

But it worked a treat round the braai the other day.

[BSG]

Wait, nobody has suggested a little bit of lighter fluid and a match, the resultant little explosion will cause the air to expand and seat the tire to the rim. This will also then remove the source of oxygen so the flame will die.

 

A little ghetto, probably not the best with carbon rims and cotton side walls.

 

But it worked a treat round the braai the other day.

I've used this method many times on a 4x4 and gholf cart wheels, last week did it again with one of our carts and I managed to burn all the hair off my forearm, used hairspray.[emoji33][emoji85]

 

Sent from my VTR-L09 using Tapatalk

[Letum911]

I've used this method many times on a 4x4 and gholf cart wheels, last week did it again with one of our carts and I managed to burn all the hair off my forearm, used hairspray.[emoji33][emoji85]

 

Sent from my VTR-L09 using Tapatalk

 

This is why body-cams should become a prerequisite!!!

[WaynejG]

This is why body-cams should become a prerequisite!!!

Also the reason why woman live longer. LOL

 

Sent from my SM-G955F using Tapatalk

[Paul Ruinaard]

Or like me it the sidewall was a bit stuffed. So it blew off the tyre sideways at about 4 bar and sent the contents of the tyre everywhere.

 

I was bending down over the whell and had it between my lknees at the time.

 

Latex in the hair is never good and it was like something out of a B grade porn movie.

 

The dogs wouldnt stop barking. My wife came running and there was latex all the way up the side of my legs and the wall. Needless to say she pissed herself laughing....

[Pure Savage]

Or like me it the sidewall was a bit stuffed. So it blew off the tyre sideways at about 4 bar and sent the contents of the tyre everywhere.

 

I was bending down over the whell and had it between my lknees at the time.

 

Latex in the hair is never good and it was like something out of a B grade porn movie.

 

The dogs wouldnt stop barking. My wife came running and there was latex all the way up the side of my legs and the wall. Needless to say she pissed herself laughing....

That must have looked amazing!!

[droo]

Wait, nobody has suggested a little bit of lighter fluid and a match, the resultant little explosion will cause the air to expand and seat the tire to the rim. This will also then remove the source of oxygen so the flame will die. 

 

A little ghetto, probably not the best with carbon rims and cotton side walls. 

 

But it worked a treat round the braai the other day.

 

Aerosol deo also works a bomb. And offsets the ammonia smell a bit.

 

Problem with the Jalco rims, and anything not designed to be tubeless, is that there's often not a bead hook for the tyre to seat over so as soon as you let it down the bead unseats again.

[Headshot]

Some rims work very well and some don't. Same with tyres. The best ones have a sticky bead and sit nicely on the rim with the beads against the sides. Like a Maxxis Minion Exo casing. Hit the large volume pump and voila! . Try the same thing with a Conti Mountain King or a Specialized Ground Control and you'll soon be swearing though.

 

The rim in question was a decent but older DT wheelset and it never gives that satisfying 'ping" as the bead seats in the bead hook/slot. 

 

I think this is because the slots are actually too big for the bead which would also explain why some tyres seem to leak sealant into the bead where it congeals making the situation worse when dirt mixes with it and it sets. 

 

For multiple satisfying "pings" I think  No Tubs rims and either a Maxxis or Schwalbe tyre is hard to beat.