Seized carbon seat post on carbon frame - HELP!

[mecheng89]

Good afternoon Hubbers,

 

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

 

2016 Merida Reacto. 

[RobertWhitehead]

It took me a week to get done but I got it out. You will have to sacrifice the seat post though ????.

[King_Crispy]

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.

[DieselnDust]

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

[King_Crispy]

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.

[Blackheart]

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.

[DieselnDust]

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.

That should not have happened. Must have had an underlying issue.

[Thomo]

Most recommendations suggest that a combination of lube, heat, even force and patience is required ... and probably some luck too.

[King_Crispy]

That should not have happened. Must have had an underlying issue.

It was an ally seatpost.

Dunno, but it made a VERY loud crack sound as it let out it's last

[Patchelicious]

Coke (the cola type) down the seat tube had had many successes too.

[DieselnDust]

It was an ally seatpost.

Dunno, but it made a VERY loud crack sound as it let out it's last

Alloy would have expanded faster and more than the carbon.

[SwissVan]

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 

[sirmoun10goat]

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

[andyrtmorgan]

I’ve got an aluminum post stuck in my steel frame. Fortunately it’s the right height. I’ve taken the clamp off and just ride her like that. Maybe one day she’ll ease up. I take a seat clamp along on long rides just in case ????

[DieselnDust]

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

[DieselnDust]

I’ve got an aluminum post stuck in my steel frame. Fortunately it’s the right height. I’ve taken the clamp off and just ride her like that. Maybe one day she’ll ease up. I take a seat clamp along on long rides just in case

 

 

 

huh?!! How did you get the clamp over the saddle cradle?