Integrated headset for DCR (Deda internal cable routing) system and compatible with Vinci, Alanera and Superbox stem. It allows the full integration of the cables through the headset bearing. The DCR system works with a standard tapered fork steerer (1-1/8” - 1.5”), but requires a 52mm (1.5”) upper headset bearing od. The special compression ring design leaves room for the cables to fit the gap in between the headset bearing and the fork. The DCR topcover for Alanera, Vinci and Superbox is included in the kit sold with the product.