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The SRAM X01 Eagle rear derailleur is the race-proven mechanical mech that sits one step below XX1 in the Eagle family — built around a 52-tooth max cog for the full 520% Eagle range, with 10-50T backward compatibility. The X-HORIZON straight parallelogram keeps shifting precise under load, the Type-3 ROLLER BEARING CLUTCH holds chain tension quietly through rough terrain, and CAGE LOCK makes wheel and chain removal quick.
| Model | SRAM X01 Eagle Rear Derailleur (mechanical, RD-X0-1-B2) |
| Part Number (MPN) | 00.7518.138.000 |
| Speeds | 12-Speed |
| Cage | Long, aluminum |
| Max Cog | 52T (10-52T Eagle cassettes; compatible with 10-50T) — 42T chain wrap |
| Clutch | Type-3 roller bearing clutch + CAGE LOCK |
| Color | Red |
| Weight | 276 g (9.7 oz) |
| Compatibility | SRAM Eagle 12-speed mechanical drivetrains (X-ACTUATION shifter + Eagle chain + cassette) |
| UPC | 710845853494 |
| Condition | Brand new |