Supercharged shifting with bulletproof precision. Sacrifice nothing. . . not durability, dependability, or performance - nothing. The SRAM Rival Rear Derailleur matches SRAMS " Exact Actuation" with tried-and-true competition proven design and construction. Exact Actuation delivers even gear changes over the entire shifting range via a precise 3mm adjustment from gear to gear. Maximized for 10 speed systems, the SRAM Rivals design is descended from SRAMS legendary MTB rear derailleurs. It weighs only 188g but features an all-aluminum B-Knuckle inner link and cage that can stand up to any serious riders demands.