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