Gravity DX HD 1-1/8" steer 1-1/8" ZS top/1.5" low

Gravity DX Reducing Headsets for 1-1/8" steerer tube in tapered headtube.
Lower 1.5", reducing cup
44mm Upper Headtube Inside diameter
49.57mm (Standard 1.5") Lower Headtube Inside diameter
30mm Crown Race
Upper Zero-Stack cup presses into headtube
36/45 degree ACB (Angular Contact Bearings)