absoluteBLACK Oval CINCH Direct Mount Boost HG+ Chainring - BlackWorks ONLY with Shimano 12 speed CN M9100, 8100 & 7100 chains Oval rings help the rider to spin smoother and more efficiently Example: 32t is equivalent to 30t at dead spot and 34t at the power zone Fits Race Face cranks with the Cinch system and provides 3mm offset for Boost spaced bikes Narrow wide tooth profile keeps the chain snug, allowing you to leave the chain guide behind Designed in UK, manufactured in Poland Model Oval Cinch DM Ring Type HG+