Yes they hold air without a core as intended. Too bad since I first used a tubeless I made a mess when injecting the sealant. I was almost 40psi when I just put my hose in. The pressure pushed my syringe out and the sealant filled in all of my rookie mistakes. Reducing the pressure to 5-10psi before applying the sealant will prevent this, but the tire will still hold its shape and stay in place. Good product.
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