An alu seat post can stic in a Ti frame very quickly

[HLaB]

Can't believe how fast its happened, alu seat post stuck in a ti frame. I had a bike fit prior to Christmas and moved the post easily then. Went through a flood yesterday and decided tonight to remove the seatpost to help the frame dry out, it was stuck big time after just 2 and a bit months. I'll investigate in the morning

 

[the_mikey]

That's a problem caused by having two different metals next to each other, same thing happens to steel bolts in an aluminium alloy frame.

 

[screenman]

Can't believe how fast its happened, alu seat post stuck in a ti frame. I had a bike fit prior to Christmas and moved the post easily then. Went through a flood yesterday and decided tonight to remove the seatpost to help the frame dry out, it was stuck big time after just 2 and a bit months. I'll investigate in the morning

What grease did you use? one we need to stay clear of that is for sure.

 

[biggs682]

not good news

 

[Rohloff_Brompton_Rider]

Can't believe how fast its happened, alu seat post stuck in a ti frame. I had a bike fit prior to Christmas and moved the post easily then. Went through a flood yesterday and decided tonight to remove the seatpost to help the frame dry out, it was stuck big time after just 2 and a bit months. I'll investigate in the morning

Oh dear, galvanic corrosion - read not good.

 

[Cycleops]

You just to smear on some grease from time to time.

 

[ianrauk]

hmmm...not good.
Best stick to same metals or CF posts.
But you don't need me to tell you that.

 

[HLaB]

Might pop to Wilconson at lunchtime and see if I can pick up some WD40 apparently some folk have tried that wirth success, the other idea is freezing and failing that cut out. Its the right height so I could live with it but I like have the option to remove it!

 

[Globalti]

It will be aluminium oxide, which occupies more space than the metal. If you manage to break the bond the oxide will "pile up" as you rotate the post, making any movement progressively harder.

 

[robgul]

Coca Cola (yes really) works as a release agent for alloy stuck seat posts .... simplest is to put the frame upside down, remove the bottle cage on the seat tube and squirt the Coke through the bolt hole (a small squirty bottle will required) - leave it to run down the tube and penetrate the seatpost/tube ... and keep topping up the Coke - may take a few days but it does work.

Rob

 

[ColinJ]

Coca Cola (yes really) works as a release agent for alloy stuck seat posts .... simplest is to put the frame upside down, remove the bottle cage on the seat tube and squirt the Coke through the bolt hole (a small squirty bottle will required) - leave it to run down the tube and penetrate the seatpost/tube ... and keep topping up the Coke - may take a few days but it does work.

Rob

Makes you wonder about what it does to teeth ...!

 

[PatrickPending]

There's about 1.3V difference in their electrode potential, which is enough I guess.. Glad I stuck a CF post in my Ti frame, and even Ti bolts.....

 

[HLaB]

hmmm...not good.
Best stick to same metals or CF posts.
But you don't need me to tell you that.

Soaked it last night in Wilko's own brand WD40 and if it budges CF post looks the way to go; I take it you've had no problem there?

 

[ianrauk]

Soaked it last night in Wilko's own brand WD40 and if it budges CF post looks the way to go; I take it you've had no problem there?

I have a Ti post with my Ti frame and no problems. Had to remove the posts a few weeks back after a year of being clamped and it came out easy enough,

 

[HLaB]

I have a Ti post with my Ti frame and no problems. Had to remove the posts a few weeks back after a year of being clamped and it came out easy enough,

Thanks I'll have a look around more for a ti post, the ones I quickly looked at yeasterday were circa £150 for a 31.6mm.