Just five years ago, the seatpost category of mountain bike components was pretty bland: it consisted of short metal tubes that hold up bike seats. While those static seatposts are still a major product on the market, the real story in this gear category is the advent of the dropper post.
Dropper posts, also known as "seat droppers," allow the rider to quickly drop the saddle out of the way, usually by use of a handlebar-mounted lever. Dropping the saddle out of the way provides more room to move above the bike in rough terrain, more room to lean the bike in the corners, and it also allows the rider to get his center of gravity as low as possible.
Some dropper posts are completely mechanical, with cable actuation and hydraulic inners. Gravity Dropper produces excellent completely-mechanical dropper posts. Other posts have hydraulic inners but are still cable actuated. KS makes many excellent seatposts like this. And finally, some dropper posts are completely hydraulic, with hydraulic inners and hydraulic actuation. Rock Shox's Reverb line of dropper posts is completely hydraulic.
|Azonic AZ quick release post clamp||Bontrager Race||Bontrager Race Lite||Bontrager Race X Lite ACC||Bontrager RaceLite|
|Bontrager Rhythm Elite||Cane Creek Thudbuster LT||Crank Brothers Cobalt 11||Crank Brothers Cobalt 2||Crank Brothers crank brothers cobalt 3|
|Crank Brothers Joplin||Crank Brothers Kronolog||DSP Racing Bighorn SHR||Easton EA50 Seatpost||Easton EC 70|
|Easton EC90 Zero Seat Post||Easton Haven Carbon||Easton Haven Carbon||Easton Havoc||Forte Forte Carbon|
|Forte Team Alloy||Fox D.O.S.S.||FSA Gravity||FSA SL-250 SB.20 SBS||Generic Seatpost|
|Giant Connect||Giant Contact seat post||Giant Contact Switch Remote Seatpost||Gravity Dropper Classic||Gravity Dropper Turbo|
|Gravity Dropper Turbo LP||Hope QR Seatclamp Black||Kalloy Uno SPC-105 Carbon||Kind Shock ETen||Kind Shock i7R|
|Kind Shock i900-R||Kind Shock i950||Kind Shock KSP-850||Kind Shock LEV||Kind Shock LEV Integra 150mm|
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|Kind Shock seatpost||Kind Shock Supernatural 27.2||Loaded Precision X-lite||Lynskey Titanium Seatpost||Nashbar Suspension 2 MTB seatpost|
|Niner Carbon Seatpost||Niner Niner RDO seatpost||Nukeproof Warhead Layback SeatPost||Race Face Chester||Race Face Deus XC|