* Adjust the geometry of your bike by changing the head tube angle by 1º with the GeoShift Performance Angle Headset.* Ultralight Stem Cap With Integrated Spacer plus an aluminum bolt and a star nut* 5mm top cover = 6mm total stack* O-ring seal prevents water intrusion around the steerer tube* Custom-molded upper lip seal provides additional protection for upper bearing* Optional shim washers if needed* Custom-molded dual-lip seal on the crown race to protect lower bearing in the toughest weather and trail conditions* 150487-01 and 150487-05 made for use in Short Head tubes (90-114mm)* 150487-02 or 150487-06 made for use in Long Head tubes (115-140mm)