Designed to fit 94 BCD 4-Bolt cranks such as the SRAM X1 crank, these rings will provide maximal chain retention and minimal noise. These rings feature the patent-pending Drop-Stop asymmetrical tooth design for the best in wear life, mud clearance, and chain retention. FEATURES SPECS FEATURES: Features Wolf Tooth's Drop-Stop tooth design for maximum chain retention Drop-Stop chainrings are designed for use with 1x9, 1x10, 1x11, and 1x12 drivetrains Compatible with all 10-, 11-, and 12-speed chains, with the exception of Shimano 12-speed chains Shimano 12-speed chains require the use of Wolf Tooth's Shimano 12-speed specific chainrings If using a 9-speed drivetrain, use a 10-speed chain, which will provide a tighter fit for better chain retention Made from 7075-T6 aluminum for long life 49mm chainline Use of a clutch-style rear derailleur is recommended SPECS: Material: Aluminum Tooth Count: 32 Ring Position/Type: Chain Retaining Single Ring Drivetrain Speeds: 9, 10, 11, 12 Chainring BCD: 94