SRAM Eagle S100 Rear Derailleur, 12-Speed, Long Cage, 50T Max
SKU code: PSI-SR007518205000
From SRAM’s Eagle S-Series, the S100 is a mechanical 12-speed 1x rear derailleur for Eagle Drivetrain mountain bikes. It is built around a long steel cage for 10–50T cassettes and uses X-Actuation, so it pairs with Eagle Drivetrain shifters.
Highlights
- 12-speed, 1x Eagle Drivetrain rear derailleur with X-Actuation
- Long cage for cassettes up to 50T, including the 500% PG-1210 10–50T
- Drag Spring cage damper for chain retention
- Half Mount-ready mounting bolt for use with a UDH and Half Mount plate
- Steel cage
Chain control
The S100 uses SRAM’s Drag Spring cage damper to steady the cage and keep the chain under control on rough ground. SRAM also revised the bushing fitment process on this derailleur with long-term durability and precise shifting in mind.
Half Mount ready
The mounting bolt is ready for SRAM’s Half Mount. Paired with a UDH (Universal Derailleur Hanger) frame and a Half Mount plate, it adds security at the hanger.
Compatibility and fit
For 12-speed 1x Eagle Drivetrain systems: use Eagle Drivetrain (X-Actuation) shifters, an Eagle chain and a 10–50T Eagle cassette. Maximum cog is 50T with 40T total capacity. It mounts to a conventional derailleur hanger, including UDH, and is not an Eagle Transmission (T-Type) Full Mount derailleur. Our workshop can fit it and set chain gap correctly.
This SRAM component is covered by SRAM’s warranty against defects in materials and workmanship; terms are set by SRAM. Wear and service items (chains, cassettes, brake pads, rotors, tape and seals) are normal maintenance parts.
Tune Cycles can supply, fit and set up SRAM components and lodge any warranty assessment on your behalf — book at tunecycles.com.au/book.
- Mechanical 12-speed rear derailleur for 1x Eagle Drivetrain
- X-Actuation, for Eagle Drivetrain shifters
- Long cage: 50T maximum cog, 10T smallest, 40T capacity
- Drag Spring cage damper
- Half Mount-ready mounting bolt (with UDH and Half Mount plate)
- Steel cage
| Brand | SRAM |
|---|---|
| Model | Eagle S100 (RD-S100-B1) |
| SRAM part number | 00.7518.205.000 |
| Type | Rear derailleur, mechanical |
| Speeds | 12 |
| Drivetrain | 1x |
| Actuation | X-Actuation (Eagle Drivetrain shifters) |
| Cage length | Long |
| Maximum cog | 50T |
| Smallest cog | 10T |
| Total capacity | 40T |
| Cage material | Steel |
| Chain retention | Drag Spring cage damper |
| Mount | Conventional hanger; Half Mount-ready bolt (UDH) |
| Chain | Eagle |
| SKU | PSI-SR007518205000 |
| Brand | SRAM |
