Sram centera 8 speed twist shifter rear 21 shimano compatiblesram centera 8 speed twist shifter rear 21 shimano compatableperformance level recreationtechnology srs technology for light precise indexingspeeds 8 9indicator quick view windowbody 58mm overmolded half pipequot with lightweight grilonpainted finishquotcompatibility shimano rear derailleurs sram or shimano front derailleursother easy cable change