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Seat post stuck

Old 06-27-06, 10:07 PM
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melrose
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Seat post stuck

I have a titaium road bike with a dura ace seat post, the post has been in the bike unmoved since I brought it 4 years ago, I have tried to take it out to pack in a bike box and it will not come out. I have tried heaps of lubes and leaving it over night in lube but it won't move, any ideas?
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Old 06-27-06, 10:14 PM
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Sheldon to the rescue:

http://www.sheldonbrown.com/stuck-seatposts.html

Here's the part that seems to be what you need:

The torch technique is worse than useless when you are dealing with an aluminum seatpost stuck in a steel or titanium frame, because aluminum expands twice as much as steel, and 2 1/2 times as much as titanium for the same increase in temperature. In fact, the exact opposite technique will often do the trick for aluminum seatposts--cool the seatpost down as rapidly as possible. The contents of a CO2 tire inflation cartridge applied inside the seatpost can shrink it down just enough to do the trick.
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Old 06-27-06, 10:35 PM
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What lubes? WD40?

Will it twist? If it twists, twist it out. Work it back and forth maybe 30 degrees each twist. Back and forth, back and forth, back and forth. It should slowly ease out, but it won't be easy. Somebody will probably have to hold the bike down while you twist. You might even have to unscrew it out.

Your seatpost will be pretty ugly after its out.
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Old 06-28-06, 06:29 AM
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If nothing else works, try dripping household ammonia into the interface. It should dissolve the Al "corrosion" and free up the seatpost. It will have no effect on the Ti so don't worry about it hurting your frame.
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Old 06-28-06, 06:58 AM
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There is a product called PBlaster, which works very well for loosening up stuck metals. Read the can before using on Ti, as I do not know if it would affect it. I know Lowe's carries PBlaster, probably most hardware stores would.
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Old 06-28-06, 03:01 PM
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Those lubes will not work. Remove the front wheel & the saddle. Turn the bike upside down & clamp the saddle clamp in a bench mounted vise that has some jaw protectors fitted. Using the substantial leverage you now have by holding the bike at the rear axle & front downtube, move the bike back & forth. It might make a huge "crack" when it first moves & might continue to make this sound until if frees up. If just moving it back & forth does not free it up enough, I have had to stand over the top of this setup, pulling up whilst moving it back & forth. One frame took 20mins of this until it finally came out. The frame was OK & so was the post. Still racing on both!
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Old 06-28-06, 03:35 PM
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liquid wrench is the only penetrant that I have found to do anything in this situation and I have removed many a stuck seatpost. I haven't had as much luck with ammonia as others seem to have.
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Old 06-28-06, 03:42 PM
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ammonia is least destructive and you don't have to massively torque your thin-walled tubing or anything. its more time comsuming but has worked for 2 Al posts in steel frames.
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Old 06-29-06, 03:55 PM
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Thanks for everyones help, will try some of these ideas this weekend.
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