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Optis Tubeless Tire Insert 27.5" x 28 40mm Insert w Standard Presta Valve MFPN=4196300 Model Zeitgeist Pack Mount Strap SP0409 Model Zeitgeist Pack Mount Strap Capacity 732 Cu In (12 Includes tubeless valve and tape Rear Axle 12mm Thru x 148mm Rim Width (Internal) 30 Cassette Body Type Shimano Micro Spline Valve Presta Color Black Wheel Size 27 OPTIS is lightweight adding less than 90g per wheel to an ordinary tubeless set up and provides greater protection than traditional inserts that are much heavier OPTIS (Odyssey Pneumatic Tire Insert System) is a lightweight highly tunable high efficiency tubeless tire insert
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