Do all UST tires hold air for an extended period of time without the need for sealant. Wheel in particular is a mavic SLR UST.
IF not, which brand of UST tires are known for working without the need for sealant? Thanks

PS... I know.....I can save weight using tubeless ready tires with sealant, but I am not interested in using sealant on this particular set up.

The design of UST is to be run without sealant. Any tire sporting the UST label can be run sealant free...

No idea why you would want to but it is entirely possible...

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This +1

.

I plan on swapping tires depending on the locale and hate to deal with the sealant and all its mess.....

Do all UST tires hold air equally well? Are some brands more resistant to slow air leakage than others?

You can definitely count schwalbe ust tires out. Hundreds of pinholes bleeding sealant in the sidewalls when when installing.

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Not their true UST versions, at least not the kind I get in Europe.... All tight.

I've been eyeing the schwalbe tires but heard sealant is a must in those. How do you differentiate the true UST tires of theirs? Does PBK or wiggle sell those?

All UST tires hold air without any kind of sealant.

I understand why you would want to avoid the use of liquids inside of the tires. I have done that same option on my UST tires since the start mainly because of frequent tire swap.

This is the way all of us use the Tubeless tires on cars. They run without tubes and without sealant and hold air anyway.

So:

All UST tires do it!

Any UST tire holds air without assistance. "Tubeless ready" (which is NOT UST) needs help. Specialized calls tubeless ready 2bliss. Others have other names. But just to reiterate: any true UST tire (i.e. with UST in the description) is tight.

In theory, any UST tire should hold air without sealant. In practise, some tires at flat within a day due to small leaks in the side wall. I had a set of the first gen Racing
Ralph UST where one tire held pressure for a week perhaps whereas the other only managed a day.

Conclusion? If you buy Schwalbe UST tires, there is a risk of needing sealant to attain acceptable sealing. At least in my experience.

Just run sealent, even if you pour it away each time it's only ~£1.50, if you've got removeable valve cores and a syringe/tube/bottle for squirting the sealent in then you can use the bottle/syringe to soak up the fluid in the tyre as well when you change tyres. And proper UST tyres are heavy as they effectively have a tube thickness of extra rubber inside to seal them. And as soon as you catch your first thorn you'll have to use sealent (making it heavy compared to a tubeles ready tyre + sealent) or a tube (making it heavy compared to every other permetation of tyre/tube). Running sealent from the start at least means you wont have to stop mid ride to fix it and it'll be lighter than a propper UST setup.

Or do what I do, stick some tyres on and go ride, the tyres stay on untill the sealent dries out and they eventualy puncture (arround 2-3 months usualy). Then re-assess the tyre choice for the next ~2-3 months. Just find some tyres you're happy with that aren't too specialist and will do for Autumn/Winter/Spring and another set for Spring/Summer/Autumn. IME tubeless tyres work better if you fit them and leave them, constantly removing/fitting them stretches the bead and makes them harder and harder to inflate without resorting to compressed air.

I have a set of Racing Ralphs UST that are air tight without sealant. But like the others are saying here, without sealant, the first puncture you pick up, and you are flat. The couple ounces of sealant are worth not having to pull out your tubeless valve stem to put a tube in the tire to get home. The UST tires are not more puncture resistant, which is why you want the stans in there.

Rode some Conti Mountain Kings for 3 years dry

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You got 3 years out of tyres? I think we can conclude the lack of punctures was either due to the rubber being hard and thick or you weren't riding them enough