Then the suspended particles in the sealant provide surface area for the latex to coagulate around, helping it seal. When a puncture occurs, the air pressure inside your tire pushes the sealant toward the hole. The second is to repair small holes from sharp, pointy objects, like rocks or thorns.
The first is to seal the tubeless system by filling minor gaps where your tire bead connects to your rim and coating the inside of your tire to prevent air from seeping out. That liquid sloshes around the empty space between your tire and rim. Many popular tire sealants work the same way, by suspending small, solid particles in a liquid, usually latex. With several good options now available, we devised a test to determine which ones worked best for most riders. Tubeless-tire sealants for road bikes still have some catching up to do, but expectations are high for mountain bike and gravel systems. And things are getting good: Tubeless-tire sealants work, and you can find tubeless-ready wheels on bikes that cost as little as $1,000. We’ve made it through the awkward early design phases, with questionable chemistry, limiting tire standards, and messy applications. It’s been two decades since mountain bikers first started experimenting with tubeless-tire sealants.
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