The RockShox SID World Cup was designedTo fly downThe cross countryTrack, in a sophisticated manner. Black Box Motion Control adds Dual Flow compression and rebound damping. Separate circuits for low and high speed compression, as well as beginning and ending stroke rebound which results in suspensionThat floats over both stutter bumps as well as big hits. Black Box Motion Control damping withTitanium springTube Dual Flow compression damping features detented low speed adjust and shimme