RockShox Reverb Stealth Piston/Poppet Kit

You likely need this kit if your seatpost is experiencing 'squish' or sagging when you sit on it, or if the return speed has become inconsistent despite proper air pressure. These symptoms often indicate that the internal seals or the poppet valve are no longer holding hydraulic pressure effectively.

No, this specific kit is designed for the Reverb Stealth and is compatible with the 430x150mm configuration. Always verify your specific post's model year and dimensions before purchasing, as internal components can vary significantly between generations.

While it is possible to perform this service at home, it requires specific tools, including a bleed kit and internal seal installation tools, along with a solid understanding of hydraulic systems. If you are not comfortable working with pressurized hydraulic oil, it is best to have a certified technician perform the service.

This kit focuses specifically on the main piston and poppet assembly. It does not include the full range of seals or the hydraulic fluid required for a complete overhaul, so you may need to purchase additional service parts or fluid separately depending on the scope of your maintenance.

Yes, a failing poppet valve is a common cause for a seatpost that refuses to hold its position or sags under weight. Replacing the internal piston and poppet assembly is the standard fix for restoring the post's ability to lock in place.