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Seized carbon seat post on carbon frame - HELP!


mecheng89
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Good afternoon Hubbers,

 

Any tips and tricks on how to get a seized carbon seat post unstuck?

 

2016 Merida Reacto. 

Helped a few mates with this. (Also failed in 1 attempt).

 

Remove BB.

 

Spray copious amounts of WD40 into the frame between the seatpost and the frame.

(Don't worry, it comes out the BB hole).

 

Manhandle the seat with vigorous sideways movements to become free in the frame.

 

Buy another can and try again if first attempt is unsuccessful.

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You could try boiling water down the post seat interface followed by silicone garage door lube. The seat tube is usually thinner wall thickness than the seat post so material expands quicker.

you'llnneed a handlangertto hhold ointo the saddle applyuupward pressure.

 

Trynnot togget boilingwwater oon yyour ccrotch . . . Or the handlanger

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You could try boiling water down the post seat interface followed by silicone garage door lube. The seat tube is usually thinner wall thickness than the seat post so material expands quicker.

you'llnneed a handlangertto hhold ointo the saddle applyuupward pressure.

 

Trynnot togget boilingwwater oon yyour ccrotch . . . Or the handlanger

I watched this approach once.

The frame cracked.

It was easy to remove the seatpost afterwards, but the look of disappointment on the oke's face will never be forgotten.

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My method, with so far 100% success:

 

Get hold of a product called "Knock 'Er Loose" I know...but it's a legit penetrating and releasing agent.

Spray from above and below, give a good soaking.

Invert bike.

Leave for 48 hours, respray every 18 hours or so.

Clamp an old stem to the seatpost, careful not to over torque the bolts.

Get a mate to hold the frame.

Using a tube for leverage through the stem, begin applying an even amount of force, no sudden heaves or shocks.

You might have to reverse direction a few times, back and forth.

It's never failed me.

Good Luck.

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You could try boiling water down the post seat interface followed by silicone garage door lube. The seat tube is usually thinner wall thickness than the seat post so material expands quicker.

you'llnneed a handlangertto hhold ointo the saddle applyuupward pressure.

 

Trynnot togget boilingwwater oon yyour ccrotch . . . Or the handlanger

 

jinni DD...no more vino for you 

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Is carbon bonding on to carbon not unusual? I always thought this would only happen with alloy on alloy

 

 

I've worked on a few bikes were the seat post was a rather tight fit.

In a few cases this has been due to the seat post collar being too tight and the seat post has ovalised - the resin and fibres get crushed and you end up with a ridge on the seatpost. In most cases its not serious but in a few its been a real problem to get the post to move.  The ovalised post also doesn't rotate in the seat tube :(

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