Fifteen years field-testing on the North Shore, the slickrock of Moab, and legendary World Cup tracks like Mont St. Anne and Fort William have resulted in the unshakeable, unbreakable S4 guide. Utilizing the same basic architecture of our original System 1 guide, the S4 is the very definition of refinement. An upper and lower low-profile polyurethane roller spin on sealed bearings and keep your chain securely wrapped around the chainring delivering consistent and reliable performance. The polyurethane compound found in the S4 rollers was extensively tested to deliver the best blend of quiet operation and long term-durability. The polycarbonate bash guard utilized in the S4 guide protects the chain, rollers, and backplate from contact with rocks, roots, logs, or anything else for that matter and directs impact away from the frame. Whether you’re a freerider wishing for a bombproof fit-and-forget solution, an all-mountain rider seeking silent functionality, or a DH racer with a penchant for picking the roughest lines – the S4 will never let you down.

- 32-36t and 36-40t

- Aluminum backplate with captive hardware and polycarbonate wear plates

- NEW polycarbonate bash guard (or Carbon guide ring for Carbon model)

- ISCG, ISCG-05, AND BB mounting options

-Fits a wide variety of frames

- Nearly silent operation

- 193-225g depending on model (137g for Carbon and 173g for Podium)