BackcountryNew · Checked Nov 4, 2026, 5:33 AM
$82.80In stockVisit store
Rear derailleurs
SRAM SX Eagle Rear Derailleur
Mechanical 1x12 · 50T maximum
Compatibility: reviewed
Known specifications can be used by the compatibility engine.
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Competitive CyclistNew · Checked Nov 4, 2026, 4:31 AM
$82.80In stockVisit storeAmazonExact Match Verified
Technical data
Specifications
- Speeds
- 12-speed
- Supported speeds
- 12-speed
- Maximum cassette cog
- 50T
- Smallest cassette cog
- 10T
- Supported cassette combinations
- 10-50t, 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
- 40T
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-SX-1-B1 product page
- sram.com/en/sram/models/rd-sx-1-b1ManufacturerSource checked Jul 31, 2026Evidence reviewed Aug 13, 2026