Rear derailleurs
Campagnolo Campagnolo Record mechanical rear derailleur
RD20-RE124
Compatibility: reviewed
Known specifications can be used by the compatibility engine.
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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 2, 2026
- Compatibility review
- Reviewed Aug 2, 2026
Approved technical sources
- Campagnolo reviewed document evidence document-road-12-controlsManufacturerSource checked Aug 2, 2026Evidence reviewed Aug 2, 2026
- Campagnolo reviewed document evidence document-road-12-rear-derailleurManufacturerSource checked Aug 2, 2026Evidence reviewed Aug 2, 2026
- Campagnolo reviewed page evidence page-crdrecord12sManufacturerSource checked Aug 2, 2026Evidence reviewed Aug 2, 2026
- Campagnolo reviewed market_identity evidence market-rd20-re124RetailerSource checked Aug 2, 2026Evidence reviewed Aug 2, 2026
Technical data
Specifications
- Speeds
- 12-speed
- Maximum cassette cog
- 34T
- Maximum front difference
- 16T
- Drivetrain family
- Campagnolo Record mechanical 2x12
- Frame mounting
- Conventional hanger
- Total capacity
- 39T