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Optis Tubeless Tire Insert 27.5" x 28 40mm Insert w Standard Presta Valve MFPN=4196300 BB Included No Chainline Hub Compatibility Axle Type 15mm TA BB Included No Chainline Hub Compatibility 141 148 Boost Hubs Chainring BCD Direct Mount SRAM Color Gray Crank Intended Use Mountain Crank Length (mm) 175 Defined Color Gray Drivetrain Speeds 11 Drivetrain Speeds 12 Number of Chainrings Chain Retaining Single Pedal Spindle 9 16" Rings 32 Spindle Interface Type SRAM DUB Fast Black hard anodized OPTIS separates the function of the bikeʼs grip from its suspension and stability by turning the tire into a two chamber system This creates a bead lock that prevents burping protects the rim from impacts and offers a limited amount of run flat protection when the tire is damaged or punctured
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