The SRAM GX DH X-HORIZON rear derailleur is a single-speed downhill derailleur — a chain tensioner designed to keep the chain on the single chainring under DH racing and freeride loads. X-HORIZON parallel arm geometry maintains consistent chain tension through big hits and suspension travel, reducing the chain bounce and drop risk that a standard parallelogram design can't fully control.

Highlights

  • Single-speed DH derailleur — chain tensioner function
  • X-HORIZON parallel arm geometry for consistent chain tension
  • GX DH level — durable construction for DH and freeride
  • No indexing — designed for single-chainring 1x DH drivetrains
  • Compatible with SRAM DH chains

Fit and compatibility

Single-speed DH rear derailleur/chain tensioner. For 1x DH drivetrains with a single chainring. Confirm frame derailleur hanger compatibility and chain width before ordering.

Installation. Service. Compatibility. Find all the documentation needed to set up, use, and maintain your components in the SRAM Service hub.

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Features
  • X-ACTUATION™ for precise and dependable 7-speed performance
  • Fully compatible with the SRAM X01 DH drivetrain
  • X-HORIZON™ design that reduces shift force, ghost shifting and cage slap
  • 12-tooth X-SYNC™ pulley wheels

Specifications

Cage (RD) Medium
Cable pull ratio Exact actuation
Speed (RD) 7s
Color (RD) Black
Cage material (RD) Aluminum
Pulley bearings material Steel
Max tooth 28
SKU SRM-RD-GX-1DH-A3
Model # RD-GX-1DH-A3
Barcode # RD-GX-1DH-A3
Brand SRAM