The Rock Shox Reverb Stealth 31.6mm Dropper Seatpost is a whole new weapon. Its internals have been completely re-engineered to improve on its already legendary performance and to offer enhanced reliability: all the smallest details, down to the single seal, have been re-evaluated and updated to pass the hardest and longest durability tests. Additional bushing overlap also improves performance over time, while new 150- and 170-millimeter travel options are available to tame even the gnarliest of descents. This is the brand-new Reverb Stealth, engineered for the next-generation mountain biker.  Rock Shox Reverb Stealth 31.6mm Dropper Seatpost Features Completely redesigned internals with new SKF internal floating piston Improved performance and durability in all conditions Increased bushing overlap New dedicated post length per travel length