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stuck seat post
hello & help...I have a gaint XTC-C1 that I bolt around the streets of perth on i put razor blades on it so its super fast (cont'ys sport contact) retied from the dirt i now have a epic carbon comp2010..anyway i wish to lift the seat about 10mm max but its stuck hard ive had in the vice upside down & it wont shift....apart from going to a bike shop is ther anyway to fix it the bike is carbon the seat post is alloy....
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there are a few different ways
you could try something like WD-40 or a silicon based lube, spray and leave for about 15 minutes, then spray again, leave for another 5 and twist the post free.
if that doesn't work you could heat the frame and allow the alloy to expand enough to release the post (you will damage the pain this way, but you will save the post)
Its the other way round. The bike is carbon the seat post is alloy. Heating the alloy will most certainly damage the carbon.
I have no experience with carbon so I would take it to the LBS.
So it is
thats what happens when you read posts at 1am
if its that way round yeh it would definately damage it.
try the lube thou... that might work
i'll try leaving the frame in the sun half freezing water & pour that over the stem post while gently taping the frame with mallot of some description probley lift the post only to drop it back down anywhooose ive tryed the lube it just sits in the neck..happy trails.
Coca Cola - it not only rots your teeth but it rots the ally seat post corrosion. Worth a try.
i dont beleive the coke but im desperate and will try anything..mmm!!stuck.
Hmm, interesting theory. I reckon it could work but it could also eat the carbon too. I'd do more research first before emptying a can on the frame.
I'd second being cautious on that one. My father does a lot of work on roofs and they carry a pump-pack of coke to spray on the roof if they need extra traction. It may eat trhe corrosion but may also gum up the works even more.
Aluminium has a very high thermal expansion coefficient so I think temperature is the key here. Perhaps wrapping the post in cold packs from the freezer to really get the heat out of it will help?
Would hitting the post with a C02 cannister or 2 be cold enough on the aluminium?
There's a long thread here http://forums.mtbr.com/showthread.php?t=450764 although I think the OP has a carbon seatpost. The thread is long and I didn't read it all, but maybe somewhere in amongst all the comments there is an answer to your problem.
I'm not sure this would work. The CO2 cartridge would get very cold but I don't think that the expanding air would transfer the same effect onto the seatpost. I'm going back to high school physics, it's been many years, but it's all to do with Boyles Law of expanding gases. Once the gas has exited the cartridge the rate of expansion will have decreased so much that the any change in temperature would be insignificant. I could be wrong though and if there are any Physics teachers who lurk on the forums to correct me, please do.
Zinn suggests the CO2 method. Also suggests cutting a V out of the post and folding the edge of the V inwards to reduce the surface area between the post and frame.
Call me chicken but I would get the LBS to do that.