Wolf Tooth Components 36t 120bcd Drop-Stop Chainring Black narrow wide singleDesigned as a direct replacement for cranks or 4 bolt spider utilizing a 120 BCD. These rings will allow you to convert your 120 BCD crankset, like the SRAM XX and others, to a 1x application. They feature Wolf Tooth's proprietary mud clearing Drop Stop tooth profile design. NOT Compatible with Full Speed Ahead (FSA) 4 bolt cranksets. Chainline is 51mm Features Wolf Tooth's Drop Stop tooth design for maximum chain retention Drop Stop chainrings are