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Is seat clamp welded on or just pressed in?

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Is seat clamp welded on or just pressed in?

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Old 02-04-19, 11:16 AM
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mtb_addict
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Is seat clamp welded on or just pressed in?

I was examining the seat post and noticed the seat clamp looks to be two separate pieces that are simply pressed together.
I see no sign of welding or brazing.

So...is it safe to hang a bike by the saddle like second pohot below?
It seems to me not...I propose that the clamp might slip out of the seat post at some point, if a bike is hanging like that.

photo 1




photo 2

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Old 02-04-19, 12:08 PM
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I have never seen the head of the seatpost separarte fromt he shaft, though I might have heard of it happening with as a faulty design/construction issue with a line of seat posts. I wouldn't worry.
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Old 02-04-19, 03:30 PM
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There is absolutely no chance of the head slipping out of the post under the weight of the bicycle. That thing was press fit together with much more force than a human could generate.

Not to scare you, but most suspension forks have the steerer pressed into the crown in the same manner.

I wish you would quit examining things and just ride your bike.
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Old 02-04-19, 03:33 PM
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Originally Posted by dsaul View Post
There is absolutely no chance of the head slipping out of the post under the weight of the bicycle. That thing was press fit together with much more force than a human could generate.

Not to scare you, but most suspension forks have the steerer pressed into the crown in the same manner.

I wish you would quit examining things and just ride your bike.
Nice one mate.
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Old 02-04-19, 03:43 PM
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The head may be cast (you do have shown a preferences for low end stuff) and epoxied into a separate aluminum, tubing..

if you search the web, you might find examples of them separating , I even recall a 'what do I do?' post, here

where drilling, pinning, through the post tube and the head cast piece + epoxy as a solution..

better posts forge the basic structure, which is them machined round with a hole in it..
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Old 02-04-19, 07:14 PM
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I just had this with an SR post last week. A very long post that had been ridden highly extended for years.

There was a small roll pin through both the tube and cast head. The tube had cracked at the roll pin hole in the rear. I drove out the roll pin, chucked the head in a vise and thought I'd just pull the cast head out. Yeah, right. Took heat & a pipe wrench to get it off. I cut off 2 inches to clear the crack and drilled a new hole for the roll pin.

Getting the cast clamp back into the tube was about an hour of heating, pounding, cooling the casting and heating the tube. I got it back together and honestly think the roll pin is not needed as it was a tight, and I do mean tight, interference fit.
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Old 02-04-19, 07:27 PM
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I'm sure it would depend on the actual brand/model. I'd assume quite a few are single piece cast, especially higher end stuff.

Most Titanium seatposts will have a titanium tube joined to an aluminum head in some fashion.
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Old 02-04-19, 07:38 PM
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Your bike, it might happen but on a seatpost of decent quality it isn't likely to happen. I see people hang bikes on event stands all the time with no issues. I see the super cheap seatpost heads and clamps broken fairly frequently but it is an easy fix with a $20-30 post like a Kalloy or Dimension.

However the reason you don't hang your bike by seatpost when working on it, is because it is not stable or secure and could fall.
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Old 02-04-19, 07:47 PM
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It's very common for the clamps to be swaged into a tube. I had a seatpost get stuck and beat it like crazy to try go get it loose. I used an air impact chisel on it for quite a while. Didn't work, but I'm sure now that the clamp was quite securely fastened to the bottom of the seatpost
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Old 02-04-19, 11:12 PM
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Its a Lousy repair stand but you probably found it for cheap.. somewhere..
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Old 02-05-19, 06:11 AM
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Originally Posted by fietsbob View Post
Its a Lousy repair stand but you probably found it for cheap.. somewhere..
Yeah, like he grabbed a stock photo off the web or something. SMH
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Old 02-05-19, 08:08 AM
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Originally Posted by dedhed View Post
Yeah, like he grabbed a stock photo off the web or something. SMH
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Old 02-05-19, 09:59 AM
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Originally Posted by dedhed View Post
Yeah, like he grabbed a stock photo off the web or something. SMH

hard to beat the low cost of vapor ...
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Old 02-05-19, 10:41 AM
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Originally Posted by fietsbob View Post
Its a Lousy repair stand but you probably found it for cheap.. somewhere..

It's a quality "made in Japan" storage rack by Minoura. It looks like a great way to keep the bike upright for storage, instead of leaning against the wall. It's probably not intended to be a repair stand.

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Old 02-05-19, 11:37 AM
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OK i if just for storage the stress is minimal .. there are others that store by being arms under the top tube, the frame sits upon..

Worry prone? I suggest looking at those.. also..

your example it appears you cannot even turn the crank arms to oil the chain because the pedals will hit the rack uptight..







....

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Old 02-05-19, 10:19 PM
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Some are glued in, others are press fit. Ive turned the end of one on a lathe, to make a 1.1/8 candle stick. You could probably hang a car from one.
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Old 02-06-19, 08:40 AM
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Don't worry if it slips out for a little bit, it will go back in once you put your weight on the saddle.
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Old 02-09-19, 03:35 PM
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Got a pic of your bike's seatpost? Best to investigate the further.
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Old 02-19-19, 07:07 AM
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Not an issue. At all.
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