4-arm, for MTB, mod. 17, for 11-speed, 96 mm bolt circle, 7075 T6 aluminium, black SB-packaged, without thread, suitable for Shimano XTR 1x11 FC-M9000 and FC-M9020 from 2015. 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 32 Type of item attachment 4-hole Area of use MTB Main colour black Bolt circle 96 mm Rear gears 11-speed