FOX D.O.S.S. Adjustable Seatpost – Sea Otter 2012

Components Sea Otter Classic

The trick FOX D.O.S.S. or Drop Off Steep Sh*t adjustable seatpost was on display at Sea Otter, and it will be in production in May with a retail price of $439, in comes in 30.9mm and 31.6mm sizes.

The DOSS comes in either a 4 or 5-inch model, and has three positions, in what they call their CTD travel modes; Climb (fully extended), Trail (40mm midpoint drop), and Descend (completely down). The mechanically actuated system uses an adjustable air spring for the return, and internal cams for its three locking locations and to prevent rotation, and has a traditional two bolt saddle clamp, and an innovative and unique remote lever. The one piece upper tube is forged and has no threads, and slides through low friction seals, which came from their fork technical expertise.

The saddle clamp uses a more robust two bolt system because it won’t slip like a single bolt design, and they went with a side loading cable for the remote, which can be mounted on either side. The cable actuated remote, which uses a normal derailer cable, can be mounted on the top or bottom, and left or right side, and it connects to the top of the post with the side loader.

The seatposts three positions or travel modes, are actuated by a unique double paddle remote lever. You push the inner paddle (both paddles will move) to lower it to the middle position or raise it to the top, while hitting the outer allows any position to be chosen. You can catch the middle position on the way up from the lower, by doing a slight weighting of the saddle to stop it, or let it pop completely up.

It looks like it will be an interesting seatpost, and I really liked the way the post worked, as it had a secure feel and smooth operation, and I enjoyed the three positions. The remote lever functioned decently, and the design makes sense, and getting it to filter down to the middle position is a great idea, although it might take some getting used to? I like mechanical systems, as they’re durable, dependable and have a lower set of maintenance. I am looking forward to testing and reviewing a production unit over the summer, to see how the D.O.S.S. performs in the real world.

FOX D.O.S.S. Specs:

  • MSRP: $439
  • Mechanical internals
  • Dual-paddle remote with multiple mounting options
  • Pneumatic adjusted return speed (10 – 25 psi)
  • Three positions – CTD: Climb (fully extended), Trail (40mm midpoint drop), and Descend (completely down)
  • Drop options- 4″ and 5” drop options (100mm and 125mm)
  • Diameter options – 30.9mm or 31.6mm
  • Weight 620 grams
  • Availability – May 2012 timeframe
About the author: Brian Mullin

Brian has been part of the Mtbr team since 2007, where he has become an integral member of the review and test staff, specializing in technical articles. He likes to push the limits in all the sports he obsesses in, whether it's mountain biking, whitewater kayaking, extreme skiing, or sport climbing. He takes those same strengths and a good dose of insanity to his reviewing and writing on mountain biking products, creating technical, in-depth and hyperbolic articles. Whenever he's not on the bike, he might be found watching MotoGP racing, otherwise look for him out on extremely technical singletrack.


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  • shabazookawookamookahooka says:

    Hmmmmm… the cable is mounted to the top of the post… not good… s/be mounted at the bottom so it’s stationary and doesn’t move.

    That looks like a LOT of triggers on that dual paddle remote ! ;-)

  • Jesse says:

    Ohh goodie! another dropper post that isn’t available in 27.2!

  • dond says:

    wow, they are kinda late for class…… and $439 msrp for three position adj post??? They have just outpriced themselves. Whoever buys this is buying for the brand I guess.

  • hinds57 says:

    wow at 620 grams, and a cable that mounts up top with only three pos.they better not put their name on it.

  • Dano says:

    What, no Kashima coat?

  • Chris says:

    Such a disappointment from Fox. That lever is a flat out joke, top mounted cable, heavy. I expect much more from Fox…why would anybody buy this over a Reverb or KS?

  • guitarjohn21 says:

    Overpriced and overweight…..

  • Mountain says:

    It may be expensive at $439, but at least it’s heavy!

  • MrPedals says:

    I think the point of this seatpost was to create one that was as durable as a Thomson. Look carefully at the seat clamp, it’s not pressed onto the shaft. It’s milled out of one solid piece of metal, and has athomson-like clamping system. I have high hopes for this post. Most people I ahve talked to who use a dropper post love them, but they ALWAYS wine about how the break or need to be repaired. Hopefully Fox has created something that will require minimal maintenance.

  • Tahoe says:

    Funny that people don’t mention the Gravity Dropper. My riding crew rides harder, longer and farther than any of you and we all ride Gravity Droppers. A few tried Reverbs, Crank Bros and even a couple KS but they just aren’t reliable enough. Maybe if we were weekend warriors they would be good enough. But unlike you, we actually ride. If the Fox is truly reliable, then good on ‘em. There could be a new option.

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