SHIMANO 11s 12-25T CS-R8000 ULTEGRA Cassette. Shimano’s original Hyperglide (HG), introduced in the mid-1980s, was a revolutionary drivetrain system that changed how bikes shift gears. Hello Shimano fans.
Original lock ring is included. Tiny hairline scratches on the lock ring For maximum stiffness and the lightest weight, the 19 & 21t cogs are mounted on an a composite carrier and the 3 largest cogs are mounted on a aluminum carrier.