PG-720 A2Downhill optimized 7 speed The PG 720 cassette is an integral part of the SRAM 1x DH drivetrain system This is the most affordable full featured, dedicated 1x DH cassette in the industry Compatible with SRAM 11 speed chains. Fully compatible with the SRAM X01 DH drivetrain Splined driver body compatible Remove the spacer to fit slim 7 speed DH specific HG hubs. SRAM Model ID: CS PG 720 A2 Attributes Cassette Technology PowerGlide Cog Details 11 13 15