RaceFace ERA Direct Mount Wide Chainring - 34t DM CINCH For Shimano 12-Speed HG+ Compatible Chain BLK Model=P Zero SmarTube Evo These feature a one-sided lock-on

These feature a one-sided lock-on collar

Shimano and combined shifter/brake levers

34 Step-Cast Air Shaft Assembly

Width adjustment

eco-friendly material made from PET recycled bottles

RaceFace ERA Direct Mount Wide Chainring - 34t DM CINCH For Shimano 12-Speed HG+ Compatible Chain BLK Model=P Zero SmarTube Evo These feature a one-sided lock-onWide: 55mm chainline for 157mm rear spacing Stainless steel teeth provide a 500% increase in wear durability over aluminum. Carbon fiber construction reduces ring weight while improving stiffness and power transfer Direct Mount (DM) fits Race Face Cinch system splined cranks Narrow wide teeth prevent chain drop, updated tooth profile runs quieter Installs with a common Park Tool BBT 22 Shimano 12sp (SHI12) and SRAM 11 12 Shimano 11 (NW) versions 82g