4-arm, for MTB, mod. 17, for 11-speed, 96 mm bolt circle diameter, 7075 T6 aluminium, black SB-packed, without thread, suitable for Shimano XTR 1x11 FC-M9000 and FC-M9020 from 2015, HT3 7075-T6 aluminium technology chainrings with a titanium oxide electro-ceramic coating. This exclusive coating provides 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 30, type of item attachment 4-hole, area of use MTB, main colour black, bolt circle diameter 96 mm, rear gears 11-speed.