Kogel Bearings Narrow-Wide Pulleys w/ Road Seals (Blue) (12T) (For Shimano 11 Speed)

Royal Blue was a color reserved for athletes sponsored by Kogel Bearings, but now it is available to us mere mortals. The narrow-wide tooth profile on the top pulley helps to retain shifting accuracy by pushing every link of the chain. The quality of the ABEC 5 full ceramic bearings is Grade 3, one of the best. Grade 3 means that the ball has a 3/1,000,000” tolerance of sphericity which means it is extremely round, which means less friction and that the Grade 3 balls roll a longer duration than others.