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Rear derailleurs
SRAM Eagle XX1 Rear Derailleur
Mechanical 1x12 · standard hanger · 52T maximum
Compatibility: reviewed
Known specifications can be used by the compatibility engine.
Retailer offers
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Technical data
Specifications
- Speeds
- 12-speed
- Supported speeds
- 12-speed
- Maximum cassette cog
- 52T
- Smallest cassette cog
- 10T
- Supported cassette combinations
- 10-50t, 10-52t, 11-50t
- Supported front chainrings
- 1
- Maximum front difference
- 0T
- Drivetrain family
- SRAM Eagle mechanical 12-speed
- Compatible chain families
- SRAM Eagle 12-speed
- Shift actuation
- Mechanical
- Frame mounting
- Conventional hanger
- Total capacity
- 42T
Catalog trust
Evidence and freshness
Technical-source dates and retailer offer checks are separate. A retailer check does not validate compatibility.
Report a correction- Technical review
- Aug 13, 2026
- Compatibility review
- Reviewed Aug 13, 2026
Approved technical sources
- SRAM 2026 spare parts catalog
- sram.com/globalassets/document-hierarchy/spare-parts/spare-parts-catalog/2026-sram-spare-parts-catalog.pdfManufacturerSource checked Jul 29, 2026Evidence reviewed Aug 13, 2026
- SRAM MTB component compatibility map
- sram.com/globalassets/document-hierarchy/compatibility-map/mtb/2021-mtb-components-compatibility-map.pdfManufacturerSource checked Jul 29, 2026Evidence reviewed Aug 13, 2026
- SRAM RD-XX-1-B2 product page
- sram.com/en/sram/models/rd-xx-1-b2ManufacturerSource checked Jul 31, 2026Evidence reviewed Aug 13, 2026