SX Damper Collar for EX SX Damping Stack Hirobo HI0404506  [HI0404506]

Role in the Damping Stack

The Hirobo HI0404506 collar locates and secures the damper shaft inside the shock assembly on Eagle, Freya, EX and SX models, helping preserve alignment and steady damping behaviour in flight. It operates as a simple mechanical retainer rather than an electronic part.

When you service the shock, focus on fit and clearance: the collar should seat squarely against the housing, the shaft should not exhibit lateral play, and the original retaining method should be used again to prevent slippage.

For tuning, the collar is one element of the damping stack that affects how the unit compresses and rebounds. Ensuring correct seating or replacing a worn collar improves repeatability when you change oil weight or spring preload. Keep spares for quick trackside or field fixes.