The Sram Red front derailleur is an innovative mech that changed everything. Instead of merely moving back and forth the cage actually rotates to maintain a consistent angular relationship with the chain. This is what's called Yaw Technology and it eliminates the need for shifter trim. As a result of this fantastic technology shifts will feel more direct and precise for flawless performance! This incredible Sram front mech also benefits from a slim spring design to prevent interference. Constructed from the best combination of aluminium and steel the Red front derailleur delivers extreme strength and durability for a piece of kit that will really stand the test of time. You also get an integrated chain spotter with this front mech to protect your frame without adding any extra clunk, and this adjusts independently of the derailleur itself. Complete with the precision install markings the Sram Red front mech is fully featured to deliver high performance shifts, optimised by Red crank and chainrings. Features Yaw shifting Hybrid cage Integrated removable chain spotter For 2-speed front chainring Aluminium outer cage Tool steel inner cage Composite tail Compatibility: 50/34, 53/39 Max 16t difference Weight: 74g Braze-on With chain spotter 12g Colour: falcon grey & black anodized finish Please note: only compatible with new SRAM Red front shifter & chain rings)