RADBMX.CO.UK
Technical & Reference Section => Tech and Restoration => Topic started by: Funkyworm on May 17, 2013, 05:21 PM
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Ok so im sure this has happened many times before but I have a Renthall seatpost that came with a bike i purchased the other day & it's severely stuck in place in the frame , i've tried spraying gt75 every day for the last 4 days where it enters the frame & also down inside the post in to the frame & then turning the frame upside down in order to get the oil to soak in from the inside . Then i've had it in a vice but it will not move at all.
Any methods that have worked for you guys wold be greatly appreciated as this is annoying the hell out of me.
Cheers :daumenhoch:
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Ah the old stuck seatpost conundrum :smitten: :LolLolLolLol:
First things first is the frame ali or steel?
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Ah the old stuck seatpost conundrum :smitten: :LolLolLolLol:
First things first is the frame ali or steel?
it's a 531 frame !
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Ok so melting it out gradually with caustic soda is a final option :D
First try giving the post a sharp smack down further into the tube with a hammer to break the "seal" then try it in the vice again
If its slipping in the vice drill a hole throught the top of the post big enough for a decent sized alen key or something similar and try in the vice again
Other options are:
Cutting down the lenght of the post with a hacksaw blade, a ballache!
Drilling out with the right sized bit, difficult :(
Heat? not the greatest of ideas usually
A bigger vice ;D
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Ok so melting it out gradually with caustic soda is a final option :D
First try giving the post a sharp smack down further into the tube with a hammer to break the "seal" then try it in the vice again
If its slipping in the vice drill a hole throught the top of the post big enough for a decent sized alen key or something similar and try in the vice again
Other options are:
Cutting down the lenght of the post with a hacksaw blade, a ballache!
Drilling out with the right sized bit, difficult :(
Heat? not the greatest of ideas usually
A bigger vice ;D
Ok I'll get back on it n the morning , Cheers for the er (options) :daumenhoch: :daumenhoch: :daumenhoch:
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Callum I knew this was you just be reading the title ;D
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you best bet is leverage :)
clamp an old stem onto the post... put a piece of pole over the stem's 'stem'... put the frame on the floor...stand on it... push the pipe down ( gently back and forth )
The alloy post will either work loose and come out or snap off ... then you need to melt it out :daumenhoch:
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Only Success ive had mate is heat........ But very very carefully....... :tickedoff:
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you best bet is leverage :)
clamp an old stem onto the post... put a piece of pole over the stem's 'stem'... put the frame on the floor...stand on it... push the pipe down ( gently back and forth )
The alloy post will either work loose and come out or snap off ... then you need to melt it out :daumenhoch:
Sounds interesting, ok well tonight i literally ripped the vice off of the bench (it was only G-clamped on but the whole of the bench top came off !!!!! Grrrrr been on the Protein (Not)...
Filled the post & frame with gt 85 sealed the end with plastic bags & tape & flipped the frame upside down to see if it works it's way between the post & frame on from the insde of the frame.
I'll leave until Sunday & If i cant get it out of the frame Im considering cutting down the post then getting out the dremel & cutting down the recess at the back of the frame hen start cutting the post from the inside of the post outwards towards the frame if that makes sense ?
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The key thing is to break the "corrosion weld" by knocking the post down a bit first. Should twist out a treat then :daumenhoch: