The Sram GX Eagle Rear Derailleur has been designed for a maximum of 52 teeth and 12 speeds, that's why it can handle complex terrains, climbs and descents of mountain biking. It is equipped with a bearing clutch that avoids chain bounce and bumps. This bike rear derailleur is made of aluminum and the pulley bearings are made of steel. The AXS system allows connection to an application so you can be aware os the state of the battery or when it needs maintenance. The X HORIZON allows for faster and effortless shifting.The X SYNC technology provides good performance, easy shifting, and silent operation. The Eagle technology allows a light, simple, durable transmission, which is easy to maneuver and keeps the chain keeps stable at all times. Besides, this mountain bike derailleur brings a cage lock that makes wheel removal easier.Bike parts - Rear gears.SRAM GX Eagle rear derailleur.Rear deraill.Sram gx eagle x-actuation 12 speed,alu/steel,grey,long,max.52t.