Hope Retainer Chainring - 36t 104 BCD R22 BlackHope Retainer Chainring 36t 104 BCD R22 Black. The Hope 104BCD Retainer Chainring has a narrow wide tooth configuration designed for 1x10 1x11 1x12 drivetrains including SRAM T Type and Shimano HG+ set ups without the need for a chain guide. Designed to be compatible with 9 10 11 and 12 Speed drivetrains including SRAM T Type and Shimano HG+ Improved mud shedding capability and chain retention Better performance with extreme chain angles on modern 1x