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Tubeless Tire won't seal

Old 03-19-10, 10:40 AM
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Tubeless Tire won't seal

-Mavic 717 with Michelin XCR Dry tubeless tire, Stan's yellow rim tape and ust valve, Stan's sealant-

Last year I converted my wheels to tubeless with the setup above. I set it up using the installation instructions from Stan's. Installation was quick and fairly straight forward. Got it to seal right away.

Over the winter, the tire went flat.

I cleaned up and removed all dried gunk from the sides of the tire bead aswell as the inside of the rim. The problem I'm having is I can't seem to get a good seal anymore. It doesn't seem to be leaking from the sidewalls, so I don't think there is anything wrong with the tire. I patted the tire down in areas where there was leakage and that didn't seem to help. The yellow rim tape seems to be in tack. I suspect the tire has stretch abit, but could it be enough to not get a good seal?? Funny thing is only one wheel went flat, the other is fine. I've soaped the sidewalls with a healthy dose of soap/water solution, used compress air from gas station..

Any other solutions?
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Old 03-19-10, 11:32 AM
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Stick the rim and tire in a tub of water to find the leak. If it's not at the bead, it could be at a spoke.
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Old 03-19-10, 11:57 AM
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Originally Posted by NoRacer
Stick the rim and tire in a tub of water to find the leak. If it's not at the bead, it could be at a spoke.
I'll try anything at this point. Thanks
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Old 03-19-10, 02:12 PM
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Are you using a Stan's tubeless rim strip (the black rubber ones that have the valve stem as part of the rim strip)? Are you using an air compressor to inflate the tire? When you say yellow rim strip, are you just talking about the thin rim tape that comes with Stan's tubeless system (that goes directly over the spoke holes)?
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Old 03-19-10, 03:40 PM
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Originally Posted by well biked
Are you using a Stan's tubeless rim strip (the black rubber ones that have the valve stem as part of the rim strip)? Are you using an air compressor to inflate the tire? When you say yellow rim strip, are you just talking about the thin rim tape that comes with Stan's tubeless system (that goes directly over the spoke holes)?
I'm using the Stan's universal sealing tape to convert rims for Stan's tubeless system (its yellow in color) that covers the spoke holes on my Mavic 717 rims. Yes, using an air compressor to inflate.
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Old 03-19-10, 03:47 PM
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Originally Posted by klam
I'm using the Stan's universal sealing tape to convert rims for Stan's tubeless system (its yellow in color) that covers the spoke holes on my Mavic 717 rims. Yes, using an air compressor to inflate.
You need this:
https://www.notubes.com/product_info....products_id/31

The yellow rim tape simply goes over the spoke holes, but the rubber strip with valve stem has to be installed over it on rims such as your x717's. That, soapy water, Stan's sealant, and your air compressor will get you going.
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Old 03-19-10, 04:04 PM
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Originally Posted by well biked
You need this:
https://www.notubes.com/product_info....products_id/31

The yellow rim tape simply goes over the spoke holes, but the rubber strip with valve stem has to be installed over it on rims such as your x717's. That, soapy water, Stan's sealant, and your air compressor will get you going.

Done, done and done..but I get leaks...not from the sidewalls of the tire, but the seal from the bed to the rim.
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Old 03-19-10, 04:18 PM
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As I begin to inflate the tire, I hold it so that the valve stem is horizontal (parallel with the ground), and I push with my thumb against the tire's tread, lined up with the valve stem. This keeps the rubber rim strip from being blown away from the rim's surface as the air from the compressor flows into the tire. You'll feel it when the tire begins to hold air, and you can stop pressing with your thumb. I've done a bunch of these, and some tires/rims are definitely harder than others to get inflated. One thing I've noticed, and I think Stan notes this on his site, the tighter the bead is on the rim, the easier it is to get a good seal. Loose beads (like when the tire practically falls off the rim when you deflate it) are the most difficult. All I can say is use plenty of soapy water around the bead, and make sure the rubber rim strip is seated on the rim properly.
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Old 03-19-10, 04:23 PM
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I have some MAVIC 823's on XTR hubs and the back one always looses air faster than the front (I don't use sealant). I looked at the side of the rim, and the lip inside
the rim (on the horizontal surface not the vertical surface) and at the weld there was a bump on the side of the rim, and a depression on the lip (on both sides).

I ground down the bump and filled the deressions as well as I could with JB Weld and inflated the tire. It still softens faster than the front but will take 3-4 days instead of 1.
It never did go completely flat, but it did lose 10-15 psi, enough that you could notice a difference if you didn't pump it up.

But I was pumping them up to 55psi and running on hard surfaces. The benefit of a tubless tire is to run at lower PSI so it hooks up better on slick rock/roots etc
with no pinch flats, and the tire can deform around rough terrain better since there is no extra rubber tube pushing against it (at least that is the theory).
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Old 03-19-10, 07:27 PM
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After several attempts of mounting, re-mouting, I finally got it sealed. My Stan's rim tape was fine. I ended up using a different service station that had a more powerful air compressor. It's holding air so I'm good to go. Phew! I could see how many people can get frustrated with tubeless tire installation. The soap/water solution to provide the seal is key, along with high pressure air.
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