Original Cane Creek Zero Stack headset for 1.5" (49mm) head tubes for use with 1 1/8" fork. This kit only includes the upper headset assembly. Combine this upper kit and the BAA0088K upper kit to use a 1 1/8" straight steer tube on your 1.5" frame. You can also use this kit and a BAA0091K kit to use a tapered steerer in your 1.5" frame.
Kit includes one upper ZS49 cup, one bearing and one upper wedge/top plate with integrated seal, and a star nut with bolt and top cap.