The Box Three Rear Derailleur simplifies the features found on the Prime 9 Box One and Two rear derailleurs making for a fully featured wallet friendly rear derailleur.
 

• Cage: X-wide

UPC-639266097334

Manufacturer #-BX-DR3-P9AXWC-BK

Color-Black

Front Or Rear-Rear

Mount-Standard

Range-11-50T

Speeds-9

Weight-349g