Description The Aero Kolossos offers reduced friction, improved shifting accuracy, and better chain retention Includes pulleys with ceramic balls and steel races Long tooth profile on lower pulley for best chain retention Chain catcher on lower pulley to prevent chain jams Ride it on-road and off-road without restrictions TECH SPECScompatibilitySRAM 12sp Red, Force, eTap AXSsealroadcolorraw
