Wolf Tooth Components Drop-Stop Chainring 30T DM for RaceFace Cinch Cranks BlackDesigned for Race Face CINCH cranks with removable spiders. This chainring features the patent pending asymmetrical Drop Stop tooth design for the best in wear life, mud clearance, and chain retention. Made from 7075 Aluminum for long life Not compatible with 9 speed chains Features Wolf Tooth's Drop Stop tooth design for maximum chain retention Optimized for use with 10, 11, and 12 speed chains Chainline is 49mm Item Specifications Material Aluminum