Ritchey WCS Switch External Cup Headset - EC44/28.6 Upper, EC44/40 Lower, 28.6 Threadless, BlackA key component of the Ritchey Switch System, the WCS Switch External Cup Headset is designed to specifically work with the Ritchey Switch Stem to route cables, wires and hydraulic lines from the handlebar through to the bicycle frame. Cables are routed from the handlebar into the headset conduit, which sits on the underside of the Switch Stem and then travel through an opening on the front of the Switch headset spacers before passing through two