Optis Tubeless Tire Insert - 27.5" x 28-40mm Insert w/ Standard Presta Valve CheckoutTitle=AnswerBMX Seatpost Extender WTBs KOM Tough series rims

WTBs KOM Tough series rims feature Dual I-Beam construction to increases strength and stiffness

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Optis Tubeless Tire Insert - 27.5" x 28-40mm Insert w/ Standard Presta Valve CheckoutTitle=AnswerBMX Seatpost Extender WTBs KOM Tough series rimsOptis Tubeless Tire Insert 27. 5" x 28 40mm Insert w Standard Presta Valve. 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