Specialized Future Shock Integrated Headset Assembly Description: This Specialized Future Shock Integrated Headset Assembly replaces headsets found on select Specialized model bikes featuring the Future Shock frame suspension system. Features: Genuine Specialized replacement parts Future Shock headset assembly for various Specialized bicycles See compatibility tab for full list of compatible bicycles Includes: (1) Upper Bearing: Future Shock - 45.8mm OD x 36.8mm ID x 6.5mm Thick (45 x 45deg) (1) Lower Bearing: 1.8" - 56.8mm OD x 47.8mm x 6.5mm Thick (45 x 45deg) (1) Complete T73 Future Shock collar assembly (same as S192500018) (3) 5mm Future Shock cartridge spacers (1) Split Upper Compression Ring Specifications: Model Compatibility: Future Shock 3.2, Future Shock 3.3