Sram x sync dm chainring boostthis sram x sync dm chainring is specifically designed for use on plus size mountain bikes with their wider boost type rear hubs and helps to ensure you obtain the perfect chainline for optimum performance its equipped with srams x sync technology which engages with the chain much quicker than standard chainrings and provides reliable chain retention over all terrains and in all conditions sram 1x has been made even better with the simplicity of the new