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Shimano Dura Ace FC R9200 12 Speed Chainring 40t Asymmetric 110 BCD BLK NJ axle length 125mm Zoom Ace: finely adjustable Zoom Ace: finely adjustable Rings 32 Defined Color Black Spindle Interface Type SRAM DUB Chainring BCD Direct Mount SRAM Color Black Chainline Hub Compatibility 157 Super Boost Hubs Drivetrain Speeds 12 Number of Chainrings Chain Retaining Single Crank Intended Use Mountain Pedal Spindle 9 16" BB Included No Crank Length (mm) 175
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