SRAM SX Eagle 12-Speed MTB Rear Derailleur 1x12

The SRAM SX Eagle 12-speed is a rear derailleur designed for 1x12 MTB drivetrains and fully compatible with the SRAM Eagle ecosystem.

It was developed to provide reliable shifting, wide gear range and easy operation for modern mountain bikes, trail bikes and e-MTBs.

Compatibility with cassettes up to 50T allows riders to tackle steep climbs while maintaining efficient gearing for faster sections.

SRAM product code

SRAM Model ID: RD-SX-1-B1

The product code helps identify the exact derailleur model within the SRAM Eagle range.

Key features

• Genuine SRAM SX Eagle rear derailleur
• 12-speed MTB drivetrain
• Compatible with 1x12 systems
• Compatible with Eagle cassettes up to 50T
• X-HORIZON design for improved shifting stability
• X-SYNC pulleys for smoother chain operation
• CAGE LOCK system for easier wheel removal and maintenance

Performance and riding feel

The SX Eagle is designed for riders entering the SRAM Eagle world with a simple, reliable and intuitive drivetrain.

Shifting remains stable on rough terrain, while the derailleur structure helps reduce unwanted chain movement during off-road riding.

It is widely used on trail MTBs, hardtails and entry-to-mid-level e-bikes.

Compatibility

• SRAM Eagle 12-speed drivetrains
• SRAM SX Eagle
• SRAM NX Eagle
• SRAM Eagle 10-50T cassettes
• SRAM Eagle 11-50T cassettes
• MTB 1x12 setups

Technical specifications

• Brand: SRAM
• Series: SX Eagle
• Model: RD-SX-1-B1
• Type: MTB rear derailleur
• Speed: 12-speed
• Configuration: 1x12
• Max cassette size: 50T
• Technology: X-HORIZON
• Color: Black

Why choose it

• Ideal entry point into the SRAM Eagle ecosystem
• Wide gear range for modern MTB riding
• Stable and intuitive shifting
• Compatible with many Eagle components
• Great for replacement or upgrade