Chromag sequence 94 bcd x sync chainringthe sequence chainring uses the official x sync technology licensed from sram for unmatched chain retention chromag is the only mtb company officially authorised to produce chainrings with the x sync technology so now no matter what kind of mountain bike you have you can have the peace of mind that your chain will stay put features complies with sram warranty standards for compatibility with all sram x sync drivetrains chamfered mud clearing recesses