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"Cross-hatch" Seat Post Scratches

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"Cross-hatch" Seat Post Scratches

Old 11-09-21, 10:20 PM
  #1  
Chuck M 
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"Cross-hatch" Seat Post Scratches

I hate these scratches on old seat posts. Why can't people be more careful? I loosened the binder bolt on this 37 year old Raleigh and lifted the seat straight out. Why did some nudnik feel the need to go full on neanderthal with this thing? Overall the rest of the bike, while dirty was in well enough cared for condition. I'll need to somehow polish out or otherwise hide every bit of those scratches above the Max Height insertion point.
At least it isn't an anodized post. I have similar scratches on two old anodized Strong Arm fluted posts.



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Old 11-09-21, 10:28 PM
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I understand and empathize. I purchased a pantographed Pinarello seat post with similar marks. Will post pics when I get back to the shop. Buy the right size and use lube, folks!
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Old 11-09-21, 10:35 PM
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Seen a lot worse. I've polished scratches like that on dozens and dozens of posts. Comes with the territory. Pick up an iron file from harbor freight with four different textures ... and some 600 grit paper.
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Old 11-09-21, 11:51 PM
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Originally Posted by SurferRosa View Post
Seen a lot worse. I've polished scratches like that on dozens and dozens of posts. Comes with the territory. Pick up an iron file from harbor freight with four different textures ... and some 600 grit paper.
Just don't get too crazy otherwise the post will be too small afterwords.
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Old 11-10-21, 12:26 AM
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Originally Posted by degan View Post
Just don't get too crazy otherwise the post will be too small afterwords.
That's why you fit it and mark it appropriately before you start the work.
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Old 11-10-21, 12:30 AM
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Originally Posted by SurferRosa View Post
That's why you fit it and mark it appropriately before you start the work.
Yeah I was making a joke.
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Old 11-10-21, 03:24 AM
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I was guilty of this some years ago and used progressively finer emery paper from 200 to 1200 grit. It did not completely resolve the deep scratches but, as degan points out, you can actually decrease the diameter so that it might be too loose for the post.
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Old 11-10-21, 05:02 AM
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Scratches like that are hard to remove fully without some reduction in post diameter. To me , the fact that they are so deep tells me there was a burr or something that actually cut into the soft alloy. Maybe an over tightened cinch bolt that was not properly loosened or released , it is definitely worse than normal and there will probably be “witness” marks even after sanding and polishing.
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Old 11-10-21, 07:35 AM
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While a previous owner may not have loosened the seat post sufficently, the very heavy scoring suggests Raleigh did not ream/hone the seat tube and the LBS did not lubricate the post prior to installation. Had the seat tube been properly finished and the post properly lubricated, the scoring would have far less severe, even if the binder bolt was not fully loosened. This is a case where the manufacturer and LBS share at least as much blame, and arguably more, than the previous owner.

This type of scoring, primarily along the leading edge of the seat post, is quite common on mass produced frames with a vent hole drilled into the front of the seat tube, at the junction with the top tube. If the manufacturer does not deburr that hole, it will mark the seat post in this fashion. While other root causes are possible, this is the most probable.
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Old 11-10-21, 09:42 AM
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These days and for many days before, I always clean up the seat tube cavity. I start by filing or champering the inside edge of the slot at the back (usually) of the seat tube lug. Then I use emery cloth to smooth out the bore of the seat tube cavity. Additionally, I ensure that the bore is round and that the seat tube ears are not collapsed in. I measure, using my Vernier calipers, the bore in several places to ensure roundness. With that all done, I test fit the intended seat post until I am convinced that it fits properly. Then I lube up the post and the bore of the seat tub lug liberally. In my mind, to skip a single one of these steps is a mistake.

Of course, once the seat post is badly scored, it it too late to repair the damage done. Cleaning the post and sanding or filing the score marks out will reduce the seat post diameter and allow for distortion of the seat tube bore and too much bending in of the lug ears.
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Old 11-10-21, 10:56 AM
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Wait. Are you saying there are vintage seatposts that aren't scored like that?
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Old 11-10-21, 09:14 PM
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Oh I'll buff it out the best I can and not lose sleep about it. I guess I'm just lucky this is the worst thing to happen to this bike and there is no evidence the seat post has ever been clamped too tight. This was probably as T-mar said, not correctly loosened for adjustment.
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Old 11-10-21, 09:18 PM
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Originally Posted by Andy_K View Post
Wait. Are you saying there are vintage seatposts that aren't scored like that?
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Old 11-10-21, 10:31 PM
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I have a Campy Chorus like that. It's on my rain/winter/city fix gear where it has served faithfully for years. Since I never look down at it riding, simply not an issue. (I bought it used with the markings; priced accordingly.) I also have an SR 100 something, that adjustable and huge setback MTB post that isn't scarred but doesn't look much better. I don't think I've ever seen one of those that wasn't very used and beat up.

I've seen what undersized posts do to seat lugs and ears. (And those lugs now scar the next one quite nicely.) No thanks. I'll just live with that abomination I cannot see when it matters.
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Old 11-11-21, 01:20 AM
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Snake Skin Seatpost Scratches

Originally Posted by Chuck M View Post
I hate these scratches on old seat posts. Why can't people be more careful? I loosened the binder bolt on this 37 year old Raleigh and lifted the seat straight out. Why did some nudnik feel the need to go full on neanderthal with this thing? Overall the rest of the bike, while dirty was in well enough cared for condition. I'll need to somehow polish out or otherwise hide every bit of those scratches above the Max Height insertion point.
At least it isn't an anodized post. I have similar scratches on two old anodized Strong Arm fluted posts.



I just posted this thread. While it doesn't address getting rid of the hash marks, it shows how to prevent the problem:

Flexible Hone for cleaning seat tube

I bought a bike on eBay several years ago that was "just overhauled and ready to ride"...

The worst snake skinned seatpost I've ever seen. It looked like it had been forced in and out many times!



The inside of the seat tube before...



After...



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Old 11-11-21, 01:21 AM
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Most of those can buff out on most seatposts, but sometimes it is sad when one with nice psntographs of the bike brand or height measurements are scratched up so bad and you do not have a choice but to sometimes affect the legibility of the pantographs when pushing out the deep scratches.
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