Stuck seat posts, industrial service?

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brynpoeth
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Re: Stuck seat posts, industrial service?

Postby brynpoeth » 31 Dec 2019, 3:56pm

Could a seat post be fitted with an expander bolt, like a stem?
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Mick F
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Re: Stuck seat posts, industrial service?

Postby Mick F » 31 Dec 2019, 4:00pm

alexnharvey wrote:Have any greasers or anti-seizers had a stuck post while using those methods?
Not me, never.

Not even as a kid, or as a youth. Mind you, in those days the seatposts were chromed steel.

It's an alu post in a steel tube that's the worst - dissimilar metals and all that. I served in the RN for a time on an alu frigate, and we had terrible problems with steel/alu interfaces.

Back to the OP question though. As we've agreed(?) it's a matter of prevention being better than cure, but there must be an outlet for someone to make some money out of this.
Mick F. Cornwall

rjb
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Re: Stuck seat posts, industrial service?

Postby rjb » 31 Dec 2019, 4:05pm

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brynpoeth wrote:Could a seat post be fitted with an expander bolt, like a stem?


Campag and others made them in the past but they never caught on.

https://www.google.com/search?safe=acti ... G3S8UaM%3A
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fastpedaller
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Re: Stuck seat posts, industrial service?

Postby fastpedaller » 31 Dec 2019, 4:40pm

brynpoeth wrote:Could a seat post be fitted with an expander bolt, like a stem?

This only leads to making the problem worse...… With an expander it will inevitably expand the seatpin at its lower end, which means its trying to expand (and probably will) the thin seat tube. At least with the clamp at the top of the tube ( sometimes reinforced with a lug) the tube is slotted (and drilled at end of slot) - correctly designed to be used for clamping.
Other methods, such as a captive thread on the seatube, with an allen key used to 'secure' the seatpin have been tried - the pin in tube method has probably persisted for so many years because it works!

nigelnightmare
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Re: Stuck seat posts, industrial service?

Postby nigelnightmare » 3 Jan 2020, 10:23pm

IMV stuck seatposts have become more prevalent because people have become pampered/lazy/bone idle= no maintenance,

and then when things go wrong "there MUST be a better way of doing it" or "It's obviously faulty", and blame the designer/manufacturer/seller.
It's always someone else's fault. :roll:

In general people need to start taking responsibility for their own actions or inactions.
In the case of stuck seat posts.
If you (the owner/operator) don't check & move it on a regular basis it will seize!

As "Mick F" says it only takes a minute to check, lube & adjust.

JMTPW

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SimonCelsa
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Re: Stuck seat posts, industrial service?

Postby SimonCelsa » 4 Jan 2020, 5:21am

Could a seat post be fitted with an expander bolt, like a stem?


Some comments here:

viewtopic.php?f=5&t=123718&hilit=quill+seatpost

Jamesh
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Re: Stuck seat posts, industrial service?

Postby Jamesh » 4 Jan 2020, 9:27am

My seat post is stuck on my Cannondale at my height so who cares....

If someone nicks it I'll be gutted for sentimental reasons as I've rode it a long way and also lent it to by dad on occasions.

If they do they will find they have stolen a dud as it will be hard to sell on with a stuck seat post not to mention the hundreds of paint chips and various sticky fixers for removable additions!!

Cheers James

pwa
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Re: Stuck seat posts, industrial service?

Postby pwa » 4 Jan 2020, 9:39am

Jamesh wrote:My seat post is stuck on my Cannondale at my height so who cares....

If someone nicks it I'll be gutted for sentimental reasons as I've rode it a long way and also lent it to by dad on occasions.

If they do they will find they have stolen a dud as it will be hard to sell on with a stuck seat post not to mention the hundreds of paint chips and various sticky fixers for removable additions!!

Cheers James

Trouble is, if you ever get a new saddle it may well have a different rail-saddle top height.

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Mick F
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Re: Stuck seat posts, industrial service?

Postby Mick F » 4 Jan 2020, 9:41am

Jamesh wrote:My seat post is stuck on my Cannondale at my height so who cares....
You would care if you wanted new pedals and they had a different stack height. Maybe even new shoes could change the saddle-height requirement, let alone a new saddle!

As I said, I changed my pedals, and I had to lower the saddle by nearly half an inch.

Once or twice, I've fitted "normal" pedals for everyday shoes. They lifted the stack height as it was weird pedalling without lifting the saddle.
Mick F. Cornwall

Jamesh
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Re: Stuck seat posts, industrial service?

Postby Jamesh » 4 Jan 2020, 9:58pm

Possibly but my go to spa leather saddle is just about worn in over several 1000 miles and I have several rolls turbo saddles too which are a similar height.

As for shoes my Shimano spd shoes are as tough as old boots, I'd love to change them for a newer racier pair of shoes but they do the job!!

Cheers James

PH
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Re: Stuck seat posts, industrial service?

Postby PH » 4 Jan 2020, 10:19pm

alexnharvey wrote:Have any greasers or anti-seizers had a stuck post while using those methods?

I've never had anything seize on a bike.
My most used bike gets a full service twice a year, my others once, seatpost out*, cleaned, copper slip and back at the right torque, it's not a big job.

*While the post, BB and forks are out, I'll have a look down the tubes with a torch to see if there's any signs of corrosion. Then leave it suspended upside down on the stand in front of a radiator to dry out any moisture.

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Mick F
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Re: Stuck seat posts, industrial service?

Postby Mick F » 5 Jan 2020, 6:44am

PH wrote:*While the post, BB and forks are out, I'll have a look down the tubes with a torch to see if there's any signs of corrosion. Then leave it suspended upside down on the stand in front of a radiator to dry out any moisture.
I do that too.

Also spayed in Waxoyl.
Mick F. Cornwall

gazza_d
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Re: Stuck seat posts, industrial service?

Postby gazza_d » 5 Jan 2020, 9:47am

I can vouch for the services of John The Seatpost Man. I manage to get a post stuck in a Moulton frameset and nothing would budge it.
I ended up sending it to him and he removed it quickly. Must be witchcraft
The biggest hassle was finding a courier who would touch a boxed cycle frame. A lot won't, presumably because of damage potential to expensive frame when they chuck the parcels around