Top-bike Shimano Tourney RD-M280 Rear Derailleur 7/8 Speed Mountain Bike Direct Mount Shimano direct mount rear derailleur, compatible 7 or 8 speed 13T pulleys, double Servo design keeps pulley close to sprockets for better shifting Long cage, really a whole new innovation for your MTB Shifts smoothly, accurate shifting, easy installation 100% Shimano, excellent quality products, warranty: 24-month