Alloy seatpost stuck in cromoly frame
- Thread starter Mr Panda
- Start date
1) fit a sacrificial saddle and hit it with a hammer, a lot.
2) remove BB and put plus gas into the seat tube. allow to penetrate overnight. go to step 1.
if all else fails
3) cut the top off the seatpost around 1" above the frame, using a hacksaw blade carefully slit the seatpost. Grab the top near the slit with grips and roll the seatpost in on itself
2) remove BB and put plus gas into the seat tube. allow to penetrate overnight. go to step 1.
if all else fails
3) cut the top off the seatpost around 1" above the frame, using a hacksaw blade carefully slit the seatpost. Grab the top near the slit with grips and roll the seatpost in on itself
Splatter Paint
Retrobike Rider
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Invert the bike, penetrating spray through the bottle bolt holes, leave 24h. Wrap towels around the seat tube, shed loads of boiling water, and twist the seatpost with a giant pair of molegrips or something similar on the head while getting somebody else to pull at the same time.
mechagouki
Senior Retro Guru
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twat it wi' summat'
Invert frame and remove water bottle bolts spray in a very generous amount of WD40/GT85. Leave to penetrate fro 24 - 48 hours or longer ( week is good!)
Give it a good twist and pull.
If that fails copious amounts of boiling water all over the seat tube/seat post area - again a good twist on the saddle.
if either of these fail you can safely say the seatpost if going to have to be sacrificed.
options now can be a bit on the violent side!
Remove saddle and give the seatpost a got few solid blows directly down with a hammer - may loosen it.
OR
Invert the frame and add nasty chemicals of choice (through the BB shell or water bottle cage bolts)- if it's a steel frame you can try oven cleaner (this is nasty stuff and will do you and your frames paintwork no favors - DO NOT use on an alloy or carbon frame! you do so at you own risk etc) this will effectively eat away the seatpost.
OR drill a hole in the seat post approx 2 - 3 inches above the seat collar and inset a nice long strong bar to use as leverage to twist with.
And drastic measures:
Cut the seat post approx 1.5 - 2 inches above the seat collar. get a good hacksaw blade (i'd recommend one for soft metal) and hacksaw the length of the inner seatpost - will take time and be carfull (i tend to find two adjacent cuts good or one cut at the front or one cut at the back)
Give it a good twist and pull.
If that fails copious amounts of boiling water all over the seat tube/seat post area - again a good twist on the saddle.
if either of these fail you can safely say the seatpost if going to have to be sacrificed.
options now can be a bit on the violent side!
Remove saddle and give the seatpost a got few solid blows directly down with a hammer - may loosen it.
OR
Invert the frame and add nasty chemicals of choice (through the BB shell or water bottle cage bolts)- if it's a steel frame you can try oven cleaner (this is nasty stuff and will do you and your frames paintwork no favors - DO NOT use on an alloy or carbon frame! you do so at you own risk etc) this will effectively eat away the seatpost.
OR drill a hole in the seat post approx 2 - 3 inches above the seat collar and inset a nice long strong bar to use as leverage to twist with.
And drastic measures:
Cut the seat post approx 1.5 - 2 inches above the seat collar. get a good hacksaw blade (i'd recommend one for soft metal) and hacksaw the length of the inner seatpost - will take time and be carfull (i tend to find two adjacent cuts good or one cut at the front or one cut at the back)
:evil:
Annoying this is! Won't budge a millimetre, yet.
Frame is good condition, no rust, seatpost looks ok from what I can see of it. Release spray has plenty of room to travel down tube - so i'll just keep fillin' 'er up.......
Will continue soaking with plusgas for another day or two. Just not seeing why this is stuck so fast as rest of bike is in great condition.
Maybe I need a bigger hammer
Ho hum.
Annoying this is! Won't budge a millimetre, yet.
Frame is good condition, no rust, seatpost looks ok from what I can see of it. Release spray has plenty of room to travel down tube - so i'll just keep fillin' 'er up.......
Will continue soaking with plusgas for another day or two. Just not seeing why this is stuck so fast as rest of bike is in great condition.
Maybe I need a bigger hammer
Ho hum.
http://sheldonbrown.com/stuck-seatposts.html
The ammonia advice in the link is clever stuff.
You could also try drilling an M10 hole through it and then getting a piece of M10 studding to push through the hole. Tighten a couple of nuts so it doesn't slip and then twist like merry hell, better than using a saddle as you can do it right down against the top of the seat tube so there won't be any nasty twisting created by your attempts at freeing it.[/code]
The ammonia advice in the link is clever stuff.
You could also try drilling an M10 hole through it and then getting a piece of M10 studding to push through the hole. Tighten a couple of nuts so it doesn't slip and then twist like merry hell, better than using a saddle as you can do it right down against the top of the seat tube so there won't be any nasty twisting created by your attempts at freeing it.[/code]
OK - so my hammer was big enough after all - I've just "removed" the seat mounting hardware from the top of seatpost, leaving approx 30/40mm of post sticking out top of frame - the real fun begins here :evil:
Looks like the post has been rammed in right down to the top bottle cage bolt hole and might be caught on a protrusion around that point :evil:
Things starting to get physical.
Looks like the post has been rammed in right down to the top bottle cage bolt hole and might be caught on a protrusion around that point :evil:
Things starting to get physical.
