Bicycle TutorBicycle Tutor

Show off your bike!

Related video tutorials:
Stuck saddle post
#1
Hi i have a problem with my saddle post, as it is stuck wont come up wont go down, any idears how to free it.

Reply
#2
This is one of the worst things that can get stuck, it is even "more fun" than a thread on freewheel that won't come off. My suggestion would be to follow:
http://www.sheldonbrown.com/stuck-seatposts.html
good luck, you need it.

Reply
#3
This is truly the most powerful product I have ever found for metals that seize to each other:
http://www.pbblaster.com/PB_Blaster.html
Reply
#4
Most of the time my response is, "So, you needed a new frame anyway right?"

Just kidding. It is possibly the hardest thing to get unstuck.

I usually skip steps 1 and 2, involving trying to turn with the saddle attached (Which can bend the rails), using a pipe wrench with rubber padding (Which can deform the post), and go straight to 3.

I wrap the post in a cold compress, for about 25 minutes, or as long as the compress will stay cold, and then get the CO2 cartridge and blast it. The entire cartridge. And usually that's enough to shrink the metal to the point you can take it out.

I usually go to a kitchen supply store or a paintball shop to get the cartridges. But since this is likely the only time you'll be doing this, just buy a couple from the LBS.
Dedicated scholar of bicycles
Reply
#5
You have a picture of your bike you can put here in the forum? Or list the make model?
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Reply
#6
I have to search the archives of the frame builder mailing list, there was a discussion some days ago, I think I remember that the solution was (for steel "welded" to aluminum) applying ammonia to it. It will dissolve the aluminum but not touch the steel.
Reply
#7
The ammonia trick works, but only if there is sufficient space between the seat post and the frame. if its REALLY corroded and stuck in there, there may not be room for the ammonia to do its thing.

That, and the ammonia you buy at the hardware store is an aqueous solution, since ammonia boils at -28 Fahrenheit, and the oxidation of the aluminum releases hydrogen, and if the OP smokes, this might not be a great idea in the basement.

From what I understand, quite a lot of hydrogen is given off, and it's not like you can smell it, its colorless and odorless, so you would be looking at a situation where a well ventilated area is required.

My two cents? Sacrifice the seat post and squish it in a bench vise, then turn the frame ever so slowly back and forth to release it. Seat posts are cheaper than frames. Well, some are.Big Grin
Dedicated scholar of bicycles
Reply
#8
With everything said above I am wandering what kind of Bike it is because of the type of frame. If it is a lower end MTB frame then there is bottom access which would help immensely. Could do a combination of the ammonia or pbblaster (depending on the metal make-up), hair dryer and CO2, then quickly yank like hell method! That don't work vise time!
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
Reply
#9
I've never heard of the ammonia method before. Good to know!
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Broken Saddle Bar/Spring Eugbug 0 1,645 06-04-2017, 08:16 PM
Last Post: Eugbug
  Cutting carbon seat post ajstevo 2 4,084 02-25-2016, 03:09 AM
Last Post: ajstevo
  Telescoping Seat post Old Duane 10 6,970 10-06-2015, 09:42 PM
Last Post: Old Duane
  Schwinn S Saddle Pan Cracked SpinIt 4 4,507 11-17-2014, 09:31 PM
Last Post: SpinIt
  Noob Needs Help with Saddle Post Clamp Ordering ro8ter 7 7,329 09-27-2013, 07:07 AM
Last Post: Joe_W
  Noseless saddle Chilliwack Dan 14 17,752 08-25-2013, 04:23 PM
Last Post: Pedaling
  Different saddle means different bike fit?? !TREK4ME! 3 7,259 08-02-2013, 03:04 PM
Last Post: !TREK4ME!
  Serfa saddle problem jako 4 6,123 02-26-2013, 01:47 AM
Last Post: erikbear
  Theft-proofing QR seatpost and saddle Tim M 19 24,417 02-12-2013, 06:13 AM
Last Post: 1FJEF
  New Saddle Tips? nameused 7 13,154 07-29-2011, 09:22 AM
Last Post: Joe_W

Forum Jump:



ISSN 1918-3445 © Copyright 2007-2010 Bicycle Tutor / Privacy Policy / Created by Alex Ramon

feed