Great value Alivio rear derailleur offering crisp performance on- & off-road for 9-speed drivetrains Wide link design increases rigidity & service life Alloy body & outer link leads to lower weight without compromising strength & durability 11-tooth pulleys for reduced pulley wear & chain noise Advanced light action design with low friction fluorine coated link pivot bushings Top-normal swing design Compatible with 9-speed Hyperglide sprockets