The SRAM Apex 1 Rear Derailleur is a reliable and durable 1x-specific derailleur designed for road, gravel, and adventure riding. Featuring X-HORIZON™ technology, it delivers precise and consistent shifting across the cassette while reducing chain slap. The ROLLER BEARING CLUTCH™ enhances chain stability, preventing dropped chains on rough terrain. Compatible with up to a 42T cassette, the Apex 1 derailleur provides a wide gear range, making it a great choice for riders seeking simplicity and performance in a 1x drivetrain setup.