• Series: DURA-ACE Di2 • Rear Derailleur (11-speed) • Ergonomic shifting operation without stress • SHIMANO synchronized shift • Low profile rear derailleur design • SHIMANO Shadow RD • Race endurance for less damage in crush • Maintains compact and smooth appearance • Rear Derailleur (11-speed) • Series: DURA-ACE Di2 • Maximum Sprocket: 30T • Minimum Sprocket: 11T • Maximum Front Difference: 16T • Total Capacity: 33T • Colour: Black