Wolf Tooth Components 36t Drop-Stop Chainring for SRAM BB30 Short Spindle,Black Features Wolf Tooth's Drop-Stop tooth design for maximum chain retention Works great for 190mm rear spacing Fat Bikes utilizing GXP cranks - narrows the chainline while still offering great tire clearance Optimized for use with 10, 11, and 12 speed chains Not compatible with 9 speed chains Made from 7075 Aluminum for long life