Giant OD Road Headset is compatible with all Giant OverDrive road bikes 1⅛' to 1¼' diameter. Features a composite top cap.Features- Fits Overdrive head tubes- 1⅛' to 1¼' diameter SizesFits OverDrive road bikes with 1⅛' to 1¼' diameter
Best Price: £29.74 from Cyclestore