● Size: 1.5" Head Tube Reduced to 1-1/8 " Fork Tube Semi-Integrated Headset.
● Optional: Alloy Lower Cup and Crown Race Lower Cups Insert Diameter 56mm.
● Dimension: 1-1/8"x44, 55x39.8.
● Acb sealed bearing: SK-5D / SK-15.
● Shis norm: ZS44-28.6 / ZS55-39.8.
● Height: 9.5 ±1mm.
● Material: 6061 / T6 CNC Machined Top Cover, Upper Cup, Steel Lower Cup, Crown Race.
● Weight: 128.7g.