SHIMANO ULTEGRA SHADOW RD-RX800-GS Rear Derailleur
Chain Stabilizer mechanism adopted from MTB design
ON/OFF switch
Compatible with current road DUAL CONTROL LEVER
Max. front difference: 16T
Total capacity: 39T
Low sprocket: Max. 34T/Min. 28T
Top sprocket: Max. 12T/Min. 11T
Weight: 248g