SRAM X3 is a great beginners or light adventurers rear derailleur. The X3 rear derailleur sets the standard for opening price point shifting performance. Driven by our patented 1:1 Actutation ratio, the X3 offers an intelligent blend of performance and value. Speeds 8/9 Speed Material Composite construction in B-knuckle and outer link, Steel inner link, Steel/composite cages Weight 210g long /204g medium Colors Black Outer Cage Steel Compatibility 1:1 Inner Cage Grilon® Composite Bearings Bushing Cage Sizes Long Technology Highlight(s) 1:1® actuation ratio