Rear derailleurs
Campagnolo Record mechanical rear derailleur
RD20-RE124
Compatibility: reviewed
Known specifications can be used by the compatibility engine.
Retailer offers
Where to Buy
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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
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-controls
- media.campagnolo.com/seecommerce/original/C-CL-CHORUS-12S-UM1ManufacturerSource checked Aug 2, 2026Evidence reviewed Aug 2, 2026
- Campagnolo reviewed document evidence document-road-12-rear-derailleur
- media.campagnolo.com/seecommerce/original/C-RD-CHORUS-12S-TM1ENManufacturerSource checked Aug 2, 2026Evidence reviewed Aug 2, 2026
- Campagnolo reviewed page evidence page-crdrecord12s
- campagnolo.com/us-en/rear-derailleur-record/CRDRECORD12S.htmlManufacturerSource checked Aug 2, 2026Evidence reviewed Aug 2, 2026
- Campagnolo reviewed market_identity evidence market-rd20-re124
- meinhartje.com/campagnolo-schaltwerk-record-12s/08481095RetailerSource checked Aug 2, 2026Evidence reviewed Aug 2, 2026