Shimano Dura-Ace CS-7800 12-25t 10-Speed Cassette - Missing 12t Cassette Lockring
10-speed cassettes for the Dura-Ace 7800 groupset.
A lightweight alloy sprocket carrier reduces cassette weight while increasing sprocket stiffness and improving shifting performance. The largest three or four sprockets (depending on ratios) are made of lightweight titanium, and the remainder are nickel plated chrome-moly steel for strength.
