Ritchey WCS external-cut lower headset

Genuine Ritchey Lower Headset External Cup EC with sealed titanium-coated cartridge bearing. Suitable for bikes with 44 mm I.D. head tubes that require external headset cups.
Material - lower cup and crown: alloy
Headset height: 13mm (EC44/33) - 14.3mm (EC44/40)
Head tube diameter: 44mm
S.H.I.S.: EC44/33 (1 ¼') - EC44/40 (1.5')
EC44/33 (1 ¼') bearing: 46.0/34.1/7mm 45°/45° - sealed cartridge (ACB) - titanium coating
EC44/40 (1.5') bearing: 51.9/40.0/8mm 45°/45° - sealed cartridge (ACB) - titanium coating
Weight: 61g (EC44/33) - 69g (EC44/40)
Color: black