Optis Tubeless Tire Insert – 29″ x 28-40mm Insert Only. OPTIS (Odyssey Pneumatic Tire Insert System) is a lightweight highly tunable high-efficiency tubeless tire insert. Tire assemblies are one of the most important performance factors for any bike. They provide all the grip to the ground they serve as a critical first element of the bikes suspension and they provide essential support to the cornering forces that the bike encounters. OPTIS separates the function of the bikes grip from its suspension and stability by turning the tire into a two-chamber system. This allows for lower tire pressures while the insert is inflated to a higher pressure than the tire keeping the tire supported while allowing the main volume to be at a lower pressure that provides optimum grip.

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