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parts - Why would one ever buy a 12-25 cassette when an 11-25 is available? - Bicycles Stack Exchange
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Amazon.com : SHIMANO Ultegra CS-6800 11-Speed Cassette 11-23 : Bike Drivetrain Components : Sports & Outdoors
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Amazon.com : SHIMANO Ultegra Cs-6700 Cassette 10 Speed, 11X23 : Bike Cassettes And Freewheels : Sports & Outdoors
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