Wolf Tooth 94 BCD Chainring - 30t, 94 BCD, 4-Bolt, Drop-Stop, For SRAM Cranks, BlackDesigned 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. Product Details: 49mm chainline Compatible with all 10 , 11 , and 12 speed chains, with the exception of Shimano 12 speed chains Drop Stop chainrings are designed for use with 1x9,