4-arm, for MTB, Mod. 17, for 2x10-speed, 104 / 64 mm BCD, aluminium 7075 T6, black CNC, 100% compatible with Shimano XTR FC-M980 technology HT3 7075-T6 aluminium chainrings with a titanium oxide electro-ceramic coating. This exclusive coating offers an ULTRA-HARD surface for a long service life (Hardness: 1.5 to CT2). The friction and abrasion coefficient has been significantly reduced (0.2-0.3) and offers noise reduction as well as excellent corrosion resistance. Number of teeth 26 Type of item attachment 4-hole Area of use MTB Main colour black BCD 64 mm Rear gears 2-speed, 10-speed