- help!! stuck seatpost in a steal frame
PlusGas. Lots and lots of PlusGas. Then, when you’re high as a kite and you’ve made your own hole in the ozone layer, more PlusGas.
From the outside, then through the bottle mounts (if there are any) and through the bottom bracket. Someone once recommended forming a plastercine “cup” around the seat-tube/seat post interface and pouring PlusGas into that, so there’s a resovoir of it to soak down. Leave to soak for a bit (hour or so), wiggle, repeat…Posted 9 years agoSpeshpaulSubscriber
Post in a vice is good.Posted 9 years ago
Penetrating oil, coke, caustic soda , will work on the rust.
Heat – if you can get the frame and seatpost to expand and contract at differing rates you can crack the “bond”. Gentle will save the paint on the frame, try leaving the frame outside over night, the pouring a kettle fun of water on the seat post (be careful!) then stuffing it in the vice.
Harsh – if all else fails a workshop a welding torch will heat it up for you, and the post WILL come out. But your paint will be shagged.roadiebiker-m.gMember
had similar one with stem in forks. Vice is probably best. Heating the post with blow torch(if its alu this will work well as alu is much more conductive than steel), at the same time cooling the frame with ice, its the difference in temp that will get it moving. if using a vice be careful of applying too much force to the rear stays/forks as you could put wheel alignment out.Posted 9 years agosq225917Member
caustic soda. the seatpost is galled into the frame, the oxide of aluminium take sup more space than the alloy itself so they stick together.
Caustic soda will ‘reduce’ the oxide and the post will come out.
plug the bb with plasticine and fill her up from the top and leave it overnight, leave it in the bath…Posted 9 years agoGephaudioSubscriber
I had this problem with a steel Bianchi. In the end the local bike shop sent it to an engineer, who sawed the seat post off, tapped a large thread into the seat post and then screwed in a nut. Then using spanner removed the seatpost by tightening the nut.Au and steel do not mix using copper slipgreae will stop them from binding together.Posted 9 years agospeaker2animalsSubscriber
I managed to move one from a steel road frame many moons ago. Alternating boiling/ice water. As said above the differential expansion contraction should break the bond. I then got it out easily with a mole wrench on the post and no vice.
Cut off the post near top of frame and use a pad saw then inside the post to cut out a slither of the post so you can then use a wrench to “crush” the remains of the post and pull it out.Posted 9 years agosaladdodgerMember
I did my old mtb frame set last week 10 years of not being touched
I took out the clamp bolt and wedged the seat tube open a bit. Plus gas overload for a couple of hours, then I used 2 long screw drivers and clamped them into the seat post one handle poking out forward and one backwards, more plus gas and twist out it came
SortedPosted 9 years ago
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