Shimano Ultegra Di2 RD-6870-SS Rear Derailleur - 11 Speed, Short Cage, Gray!

<div> Shimano Ultegra RD-6870 Rear Derailleurs</div><div> <ul><li>Saver function</li><li>Electronic adjustment</li><li>Wide gear ratio</li><li>Programmed motion</li><li>Sealed bearing tension pulley</li></ul> </div>