Stronglight A9 1” Alloy Threaded Headset with Sealed Bearings
Fits 1" threaded (English thread) forks. Although this headset has no rubber seals or skirt gaskets, with the tolerances that the parts are machined to, it probably doesn't need it. Tange Levin CDS 1" Threaded Headset IOS 26.4mm All Colours.