Shimano Alivio - Experience the real MTB feeling! the Alivio group offers a full range of advanced Shimano features. With its 9-speed drivetrain, powerful V-brake and disc brake systems and Rapidfire Plus shift levers, the Alivio is the trendsetter group for high-quality recreational mountain bikes.significant advantages:- less susceptibility due to the flattest construction of 9-speed shift systems- tidy, compact and integrated- increased stiffness and aggressive design, suitable for MTB of all wheel sizes- quick installation/removal of the wheel by external B-Tension or Direct-Mount rear derailleur specification- tidy cable routing, compact design and integrated optics by integrating hydraulic brake lever and shift lever technologies:HG HyperglideIn combination with Shimano Hyperglide chains, the HG cassette sprockets guarantee fast, precise index shifting. The special computer-designed sprockets have specific tooth profiles and specifically positioned climbing aids that optimize chain guidance during shifting. Fast, smooth and noiseless gear changes are the result. - Purpose: derailleur gears - Details: - Hyperglide technology - Type: cassette sprocket - Design: cassette - Number of gears: 9 - Compatibility: Shimano