1
OWNER’S MANUAL SUPPLEMENT
123394.PDF, August 08
2009 Synapse Carbon
Cutting the Seat Post
Depending on the frame size of your Synapse Carbon, the seat post
may require cutting to a shorter length. This must be performed by
a professional bike mechanic. The Synapse Carbon frame has seat
post depth in the seat tube that varies with the frame size. Small
frame sizes can accept between 110-130mm. Larger frame sizes can
accept between 110-150mm.
8 Nm
SEAT BINDER
SEAT POST
SEAT TUBE
80mm
MINIMUM
INSERT
SADDLE HIEGHT
Make a new
permanent
mark here.
80mm
17 Nm
(Saddle not shown)
Use a 220 or
lighter grit
sandpaper
to round the
cut edge.
SEAT POST
CUT END
CUTTING GUIDE
Figure 1.
To maximize saddle height adjustment range as well as maintain the
necessary minimum insert depth of 80mm of any seat post, the seat
post must be fitted (cut) to the frame.
To cut the seat post
1. Insert an uncut post into the seat tube. Insert it until it stops
inside the frame. It should slide in easily. Do not force it into the
seat tube. This is the maximum distance inside the seat tube the
post will insert.
2. Determine the maximum desired adjustment range of the
saddle that maintains the required 80mm of seat post inside the
seat tube. See Figure 1.
3. Remove the excess section from the end of the seat post. You
should use a cutting guide such as Park Tool SG-7 and a carbon
specific saw blade. See Figure 2. You should also lightly sand the
cut post to round and smooth the cut.
4. Re-mark the MINIMUM INSERT line 80mm up from the bottom of
the cut seat post. Mark the seat post without scoring, scratching
or otherwise damaging the surface of the seat post. Use a thin
decal (automotive pin striping) or a paint marker.
8 Nm
SEAT BINDER
SEAT POST
SEAT TUBE
80mm
MINIMUM
INSERT
SADDLE HIEGHT
Make a new
permanent
mark here.
80mm
17 Nm
(Saddle not shown)
Use a 220 or
lighter grit
sandpaper
to round the
cut edge.
SEAT POST
CUT END
CUTTING GUIDE
Figure 2.
NOTE: U.S. Consumer Product Safety Commission (CPSC) bicycle
regulations require minimum seat post insertion be marked on the
seat post.
WARNING
If the seat post requires cutting, have it done by a professional
bike mechanic with experience cutting high-performance carbon
components.
YOU CAN BE SEVERELY INJURED, PARALYZED OR KILLED IF
YOUR IGNORE THIS WARNING.
More Information on Carbon Seat Posts
For more information about carbon fiber seat posts, see also
“APPENDIX D. Care and Maintenance of Carbon Fiber Seat Posts” in
your Cannondale Bicycle Owner’s Manual.
