Specialized 2021-2024 Stumpjumper EVO Carbon Headset Cup Kit Description: The Specialized 2021-2024 Stumpjumper EVO Carbon Headset Cup Kit includes a spherical lower bearing cup and two upper bearing cups with different angle offsets. These cups allow for greater headtube angle adjustability to fine tune the handling characteristics on several models of Specialized carbon framed mountain bikes. Includes (one of each): Zero offset upper headset cup for 1-1/8" bearing Plus or minus 1-degree angle adjust upper headset cup for 1-1/8" bearing Spherical adapter for 1.5" lower bearing