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    Tubeless or Tubeless Ready or UST? Hopefully this will help: from Continental's website: "In contrast to UST tires, Tubeless Ready tires are lighter and are therefore air-permeable. This is sealed with a special sealing milk." This from Schwalbe: "Tubeless Ready tires are not tubeless tires. By using sealing liquid in a special process they can, however, be converted into tubeless tires." From Hutchinson: "Tubeless Ready requires latex sealant to seal the casing, as opposed to a butyl liner on the inside of the tire as with a normal Tubeless tire." Note that the liner adds weight and stiffness
    – MrTeff
    Commented Feb 8, 2019 at 4:36
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    UST just is Mavic's name for their system of tubeless rims and tires, which they've specifically designed to work well together--some tubeless tires are very difficult to mount on tubeless rims; conversely, there's the concern that poorly-fitted tubeless tires could blow off.
    – Adam Rice
    Commented Feb 8, 2019 at 18:28