Start by making sure the post is fully extended

Remove the saddle cradle using a T25 Torx driver

Remove the cable tower at the bottom of the post using a 15mm wrench. Turn counter-clockwise to remove

If needed, clamp the seatpost in softjaws or use a strap wench to hold the post

Next, remove the bottom cap of the post using a Park Tool FR5 or other Shimano compatible cassette tool. Turn counter-clockwise to loosen

Clamp the seatpost in softjaws or use a strap wench to hold the post

Remove the cap

Moving to the head of the post, insert the head of the post into the soft jaws of the vise

Using an M10 hex wrench break the screw free by turning counter-clockwise and loosen it slightly, but do not remove

The main spring is located under this screw, so caution must me used when removing the screw

The head, and only the head of the post must be supported while removing this screw. Supporting the main tube or shaft of the post while turning this screw may result in damage/binding of the seatpost keys

While supporting the cap and post, carefully unthread the cap and remove the spring

It is recommended to leave the seatpost in the vise for this step

The spring is under preload and will eject with force if not supported while removing. Use caution!

Remove the spring

The spring is not directional, so either side can go up or down

Wiggle the post head while pulling to remove

Slide the outer tube up to remove it from the post

Remove the main seal from the outer tube by turning it counter-clockwise

Now we will remove the pillar assembly from the inner tube of the seat post

Using your T25 of another tool that fits, actuate the post just as a cable would if the post were installed

While pulling the cable tower down to release the locking mechanism, carefully slide the pillar out of the inner tube

Be careful here as the balls that lock the post may fall out once released. To prevent this, you can wrap the assembly in a rag before removal to contain the balls

With pillar removed from the inner tube, use a magnet to keep the balls from disappearing

If needed, remove the brass post keys with a pick

The bushing at the bottom of the pillar can be replaced by removing the four T15 Torx screws at the bottom of the post, then removing the cap and sliding the bushing off

Slide the busing off

Use a magnet to capture the ball at the bottom of the pillar if needed

If you need to disassemble the pillar, re-install the 4 screws without the cap

Using the 4 screws at the bottom of the pillar as flats, gently clamp them in your vise

Using an M10 hex wrench, turn the pillar cap counter-clockwise to loosen

Remove the cap

Push the cable holder from the bottom to slide the cam assembly out of the pillar

Use an M3 hex wrench and any tool that will fit into the cable slot to un-thread the cable holder from the spoke

If needed, remove the set screw to access and remove the spoke

You may need to clamp the cam in the soft jaws to loosen the set screw. Be careful not to mar the cam or cam bushing

Turn the set screw counter-clockwise to loosen

Slide the spoke out of the cam

To remove the bushings from the inner tube, remove the C-clip at the bottom and slide the bushings and O-rings off

A 150mm post is shown here, 125mm posts will only use 2 bushings.

Ready to re-assemble? Then go here