12-Speed Rear Derailleurs
6 rear derailleurs that work with a 12-speed drivetrain. Speed compatibility here comes from each part's recorded specification, not from guesswork — mixing speeds across a drivetrain is the single most common upgrade mistake.
| Component | Speeds | Max cog | Wrap capacity | From |
|---|---|---|---|---|
| SRAM SX Eagle Rear Derailleur12-speed, Type-3 roller bearing clutch, 50T max | 12 | 50T | 40T | $71.50 |
| Shimano SLX RD-M7100-SGS12-speed Hyperglide+ clutch, 51T max cog | 12 | 51T | 41T | $75.29 |
| SRAM NX Eagle Rear Derailleur12-speed, Type-3 clutch, 50T max, works with 11-50T HG cassette | 12 | 50T | 40T | $98.99 |
| Shimano XT RD-M8100-SGS12-speed Hyperglide+ clutch, 51T max cog | 12 | 51T | 41T | $113.00 |
| SRAM GX Eagle Rear Derailleur12-speed, Type-3 clutch, 52T max, Cage Lock | 12 | 52T | 40T | $120.68 |
| SRAM X01 Eagle Rear Derailleur12-speed, carbon cage, 52T max | 12 | 52T | 40T | $222.60 |
Fitment values come from each component's recorded manufacturer specification. A dash means the value is not recorded for that part, not that it fits everything — check the individual component page.