Supercharged shifting with bulletproof precision. Sacrifice nothingnot durability, dependability, or performance nothing. The new 2007 Sram Rival 10 Speed 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 8 , 9 , and 10 speed systems, the Rivals design is descended from SRAMs legendary MTB rear derailleurs. It weighs only 180g but features an all aluminum B knuckle inner link and cage that can stand up to any serious riders demands.