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slipping seatpost...cures?

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slipping seatpost...cures?

Old 01-27-07, 06:36 PM
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mx_599
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slipping seatpost...cures?

thomson into a steel frame.

i am a bit hesitant to tighten anymore. i have an idea of what i might do, but i wanted to see what others have done.

thanks for your time.
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Old 01-27-07, 06:49 PM
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I guess there's no rule that says you can't use the Tacx carbon paste...
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Old 01-27-07, 06:56 PM
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Blue loctite if you're planning on messing with your position. Red if you've got it dialed in.
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Old 01-27-07, 07:00 PM
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I googled "slipping seatpost" because I had one too. Thomson masterpiece in a 98 Litespeed ultimate...I am using a campy seatpin bolt. and I use to go through many seatpin bolts per year about 2/3...because I use to adjust seat to much....I finally got the adjustment correct and to make sure the post wouldn't slip I tried ti prep and somone else suggested candle wax on post...both didn't work....Someone else on google said to try Hylomar gasket sealant....couldn't find any so I tried Toothpaste that another person said to try....it works....don't use gel toothpaste....just the regular kind. Because it has some grit in it the post has something to grab on to. Its been about 2 months and the post has not moved...I will soon check to make sure its not welded into the frame but seeing I really only ride in dry conditions I shouldn't have to worry.
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Old 01-27-07, 07:08 PM
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Originally Posted by Snuffleupagus
Blue loctite if you're planning on messing with your position. Red if you've got it dialed in.
+1, though John Ryder has an interesting suggestion. Never tried that one. Yet. <shrug>
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Old 01-27-07, 07:33 PM
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Old 01-27-07, 07:46 PM
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thanks everyone. i hadn't even thought of the thread lockers.

my idea was to use some Permatex gasket maker. it gets tacky and almost dries...but not really. i was thinking a light coating might tack up good enough and keep water out.

now the crusty idea of blue/red thread lock sounds tempting too

we'll see what happens
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Old 01-27-07, 07:53 PM
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Slipping Thompson seat posts are fairly common. The surface finish is kind of rough and the finish is slick. Using Loctite is a mis application of the product, nothing wrong I suppose if it works though. I'd try removing all grease on the seat post and frame and tighten a little harder. That's what I did on my Thompson. Worked okay but in the end I replaced it with a Ritchey Comp that cost me $25 from Nashbar - great post btw as long as you are not a weight weenie..
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Old 01-27-07, 09:46 PM
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Old 01-27-07, 09:47 PM
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I had same exact problem this time last year with a Thompson post on my Mercian steel bike.

DON'T use any of the products like Locktite described above. You need a barrier (grease) between the steel bike and aluminum post, or you'll get a chemical reaction between the two dis-similar types of metal and your post wil virtually weld to the bike. No more slipping problem, but then you've got a much bigger problem !

If the Thompson slips there is virtually nothing you can do. I got mine better by using different length seat post binder bolts - a too long one will bottom out and not draw post tight enough together. Try a shorter one.

If that does not work, and it did not work on mine, the go with a Ritchey post. That usually fixes the problem. It did on mine.

I even went one step more, though. I ran across a good deal on a vintage Campy "quill" type seat post. It actually has an expander just like a quill stem. Using that post plus correct length binder bolt and no more slipping post. I can still use grease on post to prevent aluminum/steel reaction and make it easy to remove later. The posts are made for Moser frames, I think, but they work just fine on other bikes, too. I don't tighten it as much as my stem, but just enough to keep it more snug than without the expander. And it's Campy, which is cool.
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Old 01-27-07, 09:52 PM
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Old 01-27-07, 10:07 PM
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Old 01-27-07, 11:30 PM
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Originally Posted by markwebb
And it's Campy, which is cool.
well yes...but how did you know my bike was outfitted with campy?
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Old 01-28-07, 12:24 PM
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I noticed that Thomson makes a 27.4 seat post. I'm considering getting one to solve the seat post slipping thing on my Cannondale cyclocross that has a 27.2 seat tube.
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Old 01-28-07, 12:35 PM
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Salsa Lip Lock clamp. Worked on my seatpost when Loc-Tite didnt.

Hylomar is available at about any auto parts store. Never thought about using that stuff.. its not good for much else, maybe it works on seat posts.
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Old 01-28-07, 12:58 PM
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Originally Posted by mx_599
thomson into a steel frame.

i am a bit hesitant to tighten anymore. i have an idea of what i might do, but i wanted to see what others have done.

thanks for your time.
what's the thomson made of? if it's not CF, then get over it and tighten away.
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Old 01-28-07, 01:07 PM
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Originally Posted by botto
what's the thomson made of? if it's not CF, then get over it and tighten away.
+1
just tighten the ****er 'till it's tight.
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