In any gear, Shimano Ultegra drivetrains maximise efficiency thanks to larger cogs and retain compatibility with existing hyperglide freehub bodies. The Ultegra cassettes are the new paradigm in road shifting.
The refined 12 step gear combination provides peak efficiency and accelerating performance for every racing situation.
100% genuine, made in Japan.
SPECIFICATIONS
Model: CS-R8101-12
Speed: 12 Speed
Combination: 11-30T
Spline Type: HG Spline L2
Average Weight: 291g