Wolf Tooth Shimano 110 Asymmetric BCD Chainring - 48t, 110 Asymmetric BCD, 4-Bolt, Drop-Stop B, For Shimano Cranks,Designed to fit 4 arm 110 Asymmetric BCD Shimano Road Cranksets. These rings feature the patent pending Drop Stop asymmetrical tooth design for the best in wear life, mud clearance, and chain retention. Sizes 38T and larger are compatible with Dura Ace 9100, Ultegra 8000 and 105 R7000 but a slight modification is required due to a change in the crank arm profile Drop Stop chainrings are designed for use with 1x9, 1x10, 1x11 and 1x12 drivetrains