KMC React 11 Speed Cassette, Black, 11/42T

The KMC cassettes have been carefully crafted to link perfectly with all compatible chains and unbeatable fluidity and lack of friction with KMC's own chains. Specially designed shift ramps ensure smooth and steady chain control resulting in improved shifting performance, durability, and efficiency. Features Lifting Ramps: The unique lifting ramp design carries the chain smoothly upward on the cog Lowering Ramps: Aligns the chain safe, quickly and smoothly Perfect compatibility: The KMC cog teeth design perfectly pairs with KMC chains, the reduced friction leads to perfect drivetrain coordination and increased durability Technical Specifications Compatibility: HG Driver Material: High Tensile Steel Finish: ED Black Gear ratios 11/42T: 11-13-15-17-19-21-24-28-32-36-42T 11/50T: 11-13-15-18-21-24-28-32-36-42-50T