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

by Brian Mullin on April 20, 2012

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

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