Performance without compromise - original spare parts from Shimano.the original spare parts from Shimano maintain the performance of Shimano products and offer you safety and comfort.the range includes all wear parts such as cables, brake pads, brake shoes, brake pads, sprockets and chainrings for all groups. - Material specifications: Aluminium - Application: MTB - Compatibility: Shimano Deore FC-M590 / FC-M591 rear derailleur - Front derailleurs: 3-speed - Rear derailleurs: 9-speed chainrings - Mounting / No. of holes: 4 screws - Pitch circle: 104 mm - No. of teeth: 44