SusheeToronto

I'm 15 years old in high school and I ride my bike to school everyday 5km in Toronto, Ontario so as you might know, there's a lot of snow at times. I lock it up outside which I hate but I have no choice otherwise. I had a loose seat and I decided not to fix it right away and just ride on it anyway. Soon enough I wore down the grooves on the seat post so my seat couldn't get tightened thereafter. I took it in to the shop to get a general tune-up like switch my summer tires back and to get a new seat post. Turns out he couldn't get my seat post out. He first put it on a stand and even used the whole bike as a lever point, but it was STUCK. He then tried to saw it out somehow with no prevail and finally as of yet he took it to a welder to try and melt the sucker out of there but no luck. Tomorrow he is going to try and ?burn? it out with diesel fuel and if THAT doesn't work he is going to get it drilled out at a machine shop. He is open to suggestions and I was wondering some of you must have had this problem sometime in your biking career so what was the remedy? I have a KHS DJ50 if that is of any relevance.

Thanks for your time, I appreciate it

Alfster 

Welcome to Bike Forums. You might want to check out Sheldon's advice on removing a stuck bike seat:

https://www.sheldonbrown.com/stuck-seatposts.html

East Hill

It sounds as if the hacksaw blade trick is going to be the answer, unfortunately.

Welcome to BikeForums, though!

East Hill

ryanjm

I found a lovely Bianchi steel frame with the same problem (although your bike is aluminum, which may mean the post is differently bonded). A pro at fixing this problem is Martin at Cinecycle – he works out of a coach house near Spadina and Richmond. I left the bike with him for a day or two and he not only removed the post with no damage to the frame, he replaced a brake cable that he had accidentally melted, AND cleaned out the bottom bracket from the metal filings that had fallen down the seat tube. He really knows what he's doing – stuck seatposts are apparently one of his "specialties."
Contact at: https://www.super8porter.ca/CineCycle.htm
Good luck!

TriEngineer

loosen the holding bolts, make sure that the only force preventing the seatpost from coming off is the seatpost itself, ie. loosen all bolts around collar, QR clamp, etc.

go to a hardware store and buy yourself a spray bottle of "penetrating oil"
spray generously around the collar and leave out in the garage overnight. in the morning, try rotating the post, and if that doesn't work, put a piece of 2x4 over seat and hammer down, loosen whatever is sticking, and pull the seatpost out.

I work in London, Ont, so I see a fair bit of this going on. Once you have it off, if you have it off, lather on white lithium on the post and put it back in.

Upon closer examination of your post, for those instances where the seat has come off, we use Canadian Tires rubber belted wrenches. We have once drilled through the seatpost horizontally and put a rod through that, by utilizing a couple, we were able to pull the sucker out.

antonyfhilliard

Last time I had a seatpost stuck, I hacksawed it off leaving 1" sticking out from the frame, then reached inside the seatpost with a hacksaw blade and slowly sawed the post in half. Not the best way, but it worked (after a lot of cursing).

To break the sawed seatpost free, I clamped vise-grips to the 1" stub as tightly as I could, then hammered against the grip arms to push the seatpost out of the bike frame.

SusheeToronto

Thank you for the link, I'm going to take my bike there if my more local bike shop can't get it done. They have already tried so many things and just yesterday gave it to a man and he is going to use a hydraulic jack to somehow rip it out If it doesn't work I'll be sure to take it to CineCycle. Martin seems like quite the pro, thanks =)

SusheeToronto

Just in case anyone wants to know, I couldn't take my bike to a specialized shop or the one ryanjm said Cinecycles however they came up with a solution. They sawed it off flush with the frame and then they stuck in a thinner seat post. I mean it's not the best solution because I don't have much leverage with it (I can only move it up with effort but not down at all, and it is two inches from lowest position) but it works fine for now, until I get a new frame or bike I guess.