Shimano FC-7900 Chainring Review Posted on July 4, 2018November 9, 2018 By ArchSeaLionPosted in Drivetrain ComponentsTagged Cycling, Dura Ace, Outdoor Recreation, Parts & Components, Sports & Outdoors Type: Double Speed: 10-speed Original Shimano parts guarantees that all components work perfectly for optimum performance and maximum safety and longevity.