The Sram Red 22 Front Derailleur changes everything, including offering every gear combination with no chain rub or rasp. Instead of simply moving back & forth, the derailleur cage actually rotates to maintain a consistent angular relationship with the chain. We call it Yaw&153; Technology, & it eliminates the need for shifter trim. As a result, shifts feel more direct, more precise, & combined with the new Sram Red crankset & chainrings, delivers an unmatched performance advantage in front shifting. Features Yaw&153; cage rotates in line with chain, improving the shifting speed & precision while eliminating the need for shifter trim. Slim spring design eliminates frame interference. Optimized for shifting with X G lide R&153; C hainrings. Best combination of aluminum & steel for the strongest & most durable cage we have ever made. Precision alignment markings. Integrated chain spotter protects your frame without adding any extra clunk, & adjusts independently of the derailleur itself. Two grams lighter than 10 speed version (69g) Weight: 69g (Braze-on), Chain spotter: 10.2g Compatibility: SRAM Red 22 & Force 22 Front Shift/ Brake levers & X-Glide R Chainrings