SHIMANO REAR DERAILLEUR, RD-7900, DURA ACE, SS 10-SPEED DIRECT A

The Shimano Dura-Ace RD-7900 SS 10-Speed Rear Derailleur is a unisex road bike rear derailleur made for service and restoration of mechanical Dura-Ace 7900-series 10-speed road drivetrains. The short-cage SS design is the race-oriented rear derailleur from Shimano's 7900 generation, with a compact parallelogram and low-profile cage intended for compatible close-range road cassettes. It is a generation-specific component rather than a current Shimano 12-speed replacement. Confirm shifter pull ratio, cassette range, chain capacity, hanger condition, and the rest of the drivetrain before installation. It is intended as a straightforward, serviceable component that fits naturally into a well-sorted setup, with compatibility and installation details worth confirming before use.