How to make a better tire sealant. That’s a question as old as tubeless-ready tires themselves. To date, we’ve seen a lot of different formulas. Some have stuck around, others evaporated quickly. Now, Silca is mixing up their own formula–which they call the Ultimate Tubeless Tire Sealant.
What makes it the Ultimate? Well, when setting out to create the sealant, Silca really dove into what makes different formulas successful. Sealants based on a natural latex formula generally have better sealing power, able to seal bigger holes faster. But compared to sealants with synthetic latex or other formulas, natural latex sealants typically have a shorter lifespan and don’t work as well at lower temperatures. There’s also the question of particles and additives used to make sealants plug holes better. The problem? In Silca’s testing, most of these particles are too heavy to actually move to the puncture when the tire is spinning. They claim that particles will only work if they’re mobile, and since the bicycle wheel acts as a centrifuge as it’s spinning, those particles are stuck to the inside of the tire and unable to move until you stop. By then, you’ve probably lost a lot of air and sprayed sealant all over your bike and yourself.
Looking at the performance of synthetic latex sealants, Silca claims that Cafe Latex has the best sealing power of the synthetic sealants they tested (Slime, Finish Line, WTB & Milkit). The reason? It all comes down to the foaming action. Silca then surmised […]