Ritchey Comp Cartridge Integrated Lower IS Headset

Ritchey:

The Ritchey Comp Cartridge Integrated IS headset lower features full complement stainless steel angular contact sealed cartridge bearings packed with Ritchey high-webbing grease.

Material: alloy
Stack height: zero
Headtube ID: 42, 47, 52mm
S.H.I.S.: IS42/30  (1 ?”), IS47/33 (1 ¼”), IS52/40 (1.5") 
IS42/30 (1?") bearing: 41.8/30.5/8mm 45°/45° - sealed cartridge (ACB)
IS47/33 (1 ¼”) bearing: 41.8/34.1/8mm 45°/45° - sealed cartridge (ACB)
IS52/40 (1.5") bearing: 51.9/40/8mm 45°/45° - sealed cartridge (ACB)
Weight: 32g
Colour: black