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Replaces the top bearing cover/dust cap and allows you to fir a Specialized/S-Works Tarmac SL7 Stem.
Benefits of this are you can keep a standard bar and stem set-up but have 90% integrated cables.
Has been printed and fitted to my Ribble Endurance SL as shown in the photos.
Please be aware you will also need:
Specialized HDS Tarmac SL7 Stem Cover Spacer and Transition Kit - S202500009
The space for the cables to be internally routed is not as large as the Ribble integrated headset spacer and can be a bit tight for 2 x Hydraulic hoses and 2 x Mecahnical Gear cables, but they do fit (As shown on my bike - Mechanical Ultegra with Hydraulic Discs)