Andy Antipas 

I'm restoring a mid 1980's Peugeot Px10 that has a frozen seatpost. The seatpost is designed like a handlebar stem in that it has a wedge in it to tighten it into position. The frame does not have a pinch bolt at the top of the seat cluster to hold the seatpost in place. Any idea where I could find a replacement seatpost? Many thanks.

ultraman6970

IM trying to understand what u say ok? always get stuff lost in translation.

1 the seatpost is stuck in there.

2 the bolt is not there either??

That the bolt is not there doesnt mean the wedge is not there, maybe it is? U dont mention anything about that. Just find a quill stem or a rod that fits the hole, hammer it and see if the wedge falls off.

If the thing is still stuck, put some penetrating oil in there, maybe use the BB to get the oil in?? And put the seatpost in a vice, and use the frame to get it out, u will have more lever that way. Pray the seatpost is ok after wards because will be just thing of get to get a new wedge and bolt to get it working all again.

No idea where to get that, campagnolo and american classic used to have them many years ago.

Good luck

catmandew52

Without knowing your capabilities,
1. https://www.sheldonbrown.com/stuck-seatposts.html
2. I would soak the bolt in PB blaster, loosen the bolt if possible(don't remove), take out the the crank spindle & brg's, turn the frame upside down and spray more PB blaster down the seat tube. Let it soak for an hour or so and then tap the seat post lightly in. If it moves, you can probably work it loose. Take your time.
3. Take it to LBS.
Good Luck.

Andy Antipas 

Sorry for the lack of clarity!

Ok, the seatpost is stuck. I was able to loosen the allen head cap screw to the point where the wedge" fell to the bottom of the seat tube. Because of how the tubes are mitered in the bottom bracket I can not get the wedge out.

I turned the frame upside down and sprayed PC blaster in their for a couple of days and no success. Today, I poored in some ammonia.

In addition to the the seatpost being stuck. The stem is stuck as well. Unfortunately, the seatposts are probably unobtainium and I hope to preserve it. The stem I'm not too worried about. I will cut it out if need be....

Thanks for the input!

cyclist2000

From the photo it looks like the bolt is the rusted at the top of the seat post. If the wedge is still in there then you need to loosen the wedge.

If you are trying to put a seat tube clamp on this bike there may be some problems since the seat post doesn't extend above the seat stays so there isn't room for seat tube clamp, Maybe there is the possibility of putting a bolt between the chain stays like the old raleigh pro's

ultraman6970

"Maybe there is the possibility of putting a bolt between the chain stays like the old raleigh pro's ," <--- great suggestion.

wrk101

That's a quill seat post, they have been out of production for over 20 years. To find one, I bought an entire bike, no joke. They pop up occasionally on ebay, will cost you more than what many bikes sell for. Finding a quill seatpost is difficult, and expensive. Finding one in an odd size, is almost impossible.

Ex Pres 

I see you have other rust issues as well. Have you considered an electrolysis bath? My guess is that it may not help that post/tube problem, but it couldn't hurt. And it would clean up your other rust issues.

I didn't realize Peugeot used that quill seatpost on the PX10s. I knew they did on the lower models. But I agree, you don't want to destroy it. If ammonia - and make sure it's strong hardware store stuff, not the grocery store level - doesn't work after a few days, you might want to put this on the list. I removed a stuck stem after a couple day soak in 50/50 ATF/Acetone. There are some reports that it's a good solvent, others say it's a farce. My stem is out for whatever reason.

wrk101

Whatever chemical you try, I am assuming you are putting the seat post in a large, sturdy bench vise. If not, I do not think you will get it out. I am 10 out of 11 on getting seat posts out, eventually. 1 just will not come out.

I buy a lot of neglected/used bikes. The one thing I always check is to make sure the seat post and stem are not stuck. If they are stuck, I adjust my offer lower to donor bike territory (what are the wheels and components worth). Usually, once I demonstrate that the post and stem are clearly stuck, seller will adjust price (but not always). I tell them that freeing up stuck parts is a bit of a crap shoot, and a lot of work. So my offer is based on parts.

To below, if you go the ammonia route, realize you need the strong stuff, not the household stuff. The household version of ammonia is too dilute. Handle the ammonia outdoors. And it may, or may not work. Everyone reports their successes, but I have a seat post right not where none of the prescribed solutions worked. The only thing I have left to try is cutting it out, which would NOT be an option for you, as you need to save that seatpost.

Andy Antipas 

Thank you everyone for all the suggestions. I'm going to be patient with this and will post an update when I have something to report. Fingers crossed.

gerv 

That's an aluminum seatpost in a steel seat tube. Wouldn't an ammonia bath be appropriate?

Have a look at this (and tons of other threads on the topic)... https://www.bikeforums.net/showthread...post-questions