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Old 07-28-07, 08:01 PM   #1
BikeManDan
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Stuck seatpost - mounting collar spins when you try to turn

I've dealt with a fair share of stuck seatposts...but nothing this bad

Its been sitting with PB Blaster for over a day now

The main problem here is that when I try to twist the saddle to get the seatpost to twist, the mount between the saddle and the seatpost (collar type) spins on the seatpost. Doesn't matter how hard I tighten down the bolt, the collar just spins. Tried wedging some rubber from an old tube to try to get some grip but that didn't work.


I really HATE these type of saddle mounts, the new type are so much better. But what the heck should I do in this situation?



And yes I've read Sheldon's page, all of his tips basically center around the idea of using the saddle to twist
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Old 07-29-07, 05:31 AM   #2
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Time for the hacksaw blade maneuver.
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Old 07-29-07, 06:35 AM   #3
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Is the seatpost one of the straight column type with a separate saddle clamp? These are usually found only on very cheap bikes and the posts aren't worth a lot of effort to save.

Anyway, I'd give up on using the saddle as a lever and prepare to sacrifice the entire seatpost by putting a pipe wrench on the post itself.
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Old 07-29-07, 12:24 PM   #4
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Quote:
Originally Posted by HillRider View Post
Is the seatpost one of the straight column type with a separate saddle clamp? These are usually found only on very cheap bikes and the posts aren't worth a lot of effort to save.

Anyway, I'd give up on using the saddle as a lever and prepare to sacrifice the entire seatpost by putting a pipe wrench on the post itself.
If you're thinking modern bikes then yes, they only come on cheap bikes but this bike is not modern. Prior to about 1990, all bikes seemed to have this type of mounting, not just the cheap ones


Seems like destruction is the only way. I'm having trouble envisioning the hacksaw trick. Is the slit only made on the top portion of the seatpost? What if the seatpost is rusted shut lower.
Pipe wrench would be worth a shot but I'm not so confident about it.
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Old 07-29-07, 12:51 PM   #5
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You could try drilling a hole through the post, stick a bolt through it and use it as a lever or a point to beat on it with a mallet, or yank on it with a slide hammer.

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Originally Posted by dwoloz View Post
If you're thinking modern bikes then yes, they only come on cheap bikes but this bike is not modern. Prior to about 1990, all bikes seemed to have this type of mounting, not just the cheap ones
I suppose it might seem that way to someone born in the 80's...but no.

Here's a 1960's vintage Campy post:

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Old 07-29-07, 05:30 PM   #6
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If you're thinking modern bikes then yes, they only come on cheap bikes but this bike is not modern. Prior to about 1990, all bikes seemed to have this type of mounting, not just the cheap ones.
Well, my 1983 Trek 400, my 1985 Bridgestone 400, a friends 1988 Trek 1000 and several other bikes from the '70's and '80 I've worked on all had "one piece" seatposts. All the posts with separate top clamps I've seen have been "Department Store" quality.

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Seems like destruction is the only way. I'm having trouble envisioning the hacksaw trick. Is the slit only made on the top portion of the seatpost? What if the seatpost is rusted shut lower. Pipe wrench would be worth a shot but I'm not so confident about it.
Yeah, destructive removal is probably the only way at this point. Try padding the pipe wrench to protect the post and you may be able to salvage it.

The "hacksaw trick" requires cutting the post off almost flush with the top of the seat tube, then using a hacksaw blade vertically to cut slits completely through the seat post at two or three places around the circumference. Then the loose pieces are removed individually. You have to be VERY careful to cut through the seatpost but not into the seat tube. It's not easy.
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