The Shimano Alivio SL-M3100-R Right Shifter provides responsive rear shifting for 9-speed mountain bike drivetrains. FEATURES: Rapidfire Plus technology is suited to quick shifting, giving riders the ability to downshift three gears in one stroke Optical gear display is positioned below the handlebar and indicates gear position at a glance ?SPECS: Shifter Style: Trigger Rear Der/Shifter Compatibility: Shimano Mountain Drivetrain Speeds: 9