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Thread: Creaking seatpost advice - options

  1. #1
    Senior Member Binaural's Avatar
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    Default Creaking seatpost advice - options

    I've just bought a brand new seatpost for my roadie. Now, I am heavy (110kg) and ride a lot so I represent a limit load case for these sorts of parts. It passed the carpark test with everything knotted up to spec with a torque wrench, so I was surprised to hear it creaking like a galleon under full sail up the hills. Given I thought I had done everything right I would like to ask the hive mnd:

    1. I put fibre grip paste on the seatpost (titanium frame) and then refitted the seatpost collar with anti-seize paste. The tightening bolts are loctited. I didn't grease or loctite the seatpost bolt. Would this significantly change the measured tightening torque?
    2. I did not put any grease, antiseize or loctite on the rail - should I do so? The seat has titanium rails.
    3. Given the design of the seatpost has a leaf arrangement, could it be possible that this kind of design is just prone to squeaking under heavy loads? I bought it because it has a good reputation for NOT squeaking on the reviews I read.
    4. If it turns out that I need to overtorque the seat collar to kill the squeaking, what might be a safe margin? Currently it is set to 5 N.m as recommended on the collar. The seatpost doesn't appear to be slipping after one ride and the seat hasn't move in the rails either.

    All suggestions welcome!
    The plural of anecdote is not data.

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    Looks like that post is designed to flex a reasonable amount around the saddle area so I'd be looking there first on balance of probabilities, esp as it looks like there's a quite a few places for small movements given all the touching surfaces - washer under bolt head, post to clamp, clamp surfaces, and underside of that retaining lug on top. I'd give them all a clean and light coating of whatever grease you think is most appropriate and see where that takes you.

    Mixed views on whether loctite affects torque ratings, I've seen it mentioned they say used dry ratings (all torque values are dry btw unless mentioned otherwise), and other sources where it's considered a lubricant. In either case, don't go over.
    Be careful with that, it was new once.

  3. #3
    Grumpy Old Man Spike-X's Avatar
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    Check your frame very carefully for cracks.
    Some people are like Slinkies. They serve no useful purpose, but they're fun to push down the stairs.

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    Senior Member Binaural's Avatar
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    Quote Originally Posted by Spike-X View Post
    Check your frame very carefully for cracks.
    By coincidence, I did this last week. I got the frame custom made for me about 5 years ago, and I though it was about time for a clean and inspection to make sure that nothing was going wrong. All in good order, as you'd expect given the visual quality of the welds.
    test.jpg
    The plural of anecdote is not data.

  5. #5
    Senior Member Binaural's Avatar
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    Quote Originally Posted by schred View Post
    Looks like that post is designed to flex a reasonable amount around the saddle area so I'd be looking there first on balance of probabilities, esp as it looks like there's a quite a few places for small movements given all the touching surfaces - washer under bolt head, post to clamp, clamp surfaces, and underside of that retaining lug on top. I'd give them all a clean and light coating of whatever grease you think is most appropriate and see where that takes you.

    Mixed views on whether loctite affects torque ratings, I've seen it mentioned they say used dry ratings (all torque values are dry btw unless mentioned otherwise), and other sources where it's considered a lubricant. In either case, don't go over.
    Good advice on the fittings. I am wondering if the flex is causing some rub on the bolts as well as the fit through the slot was reasonably tight.

    Yeah, I agree on the mixed views about the torque settings. Most seem to suggest using the dry rating, but a few people have checked the tightened position against dry tightening and found it quite different. I guess you are recommending that I don't overtighten at all on the seat clamp?
    The plural of anecdote is not data.

  6. #6
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    Yeah, I just meant stick with the 5nm on the seatpost clamp. G'luck.
    Be careful with that, it was new once.

  7. #7
    Grumpy Old Man Spike-X's Avatar
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    Quote Originally Posted by Binaural View Post
    By coincidence, I did this last week. I got the frame custom made for me about 5 years ago, and I though it was about time for a clean and inspection to make sure that nothing was going wrong. All in good order, as you'd expect given the visual quality of the welds.
    That's some exquisite workmanship right there.

    How about the bit where the seat goes in?
    Some people are like Slinkies. They serve no useful purpose, but they're fun to push down the stairs.

  8. #8
    Senior Member stirk's Avatar
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    It's probably that strange seat position mechanism not the post in the frame. Good luck finding the squeak.

    The welds on the frame are amazing and the best I've ever seen!
    Fertilising my post count

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    I put a little bit of grease on the seat rails where they contact the seat post clamp.

    That said the few times ive noticed a creak its actually been resolved with a couple drops of oil into the mould on the saddle where the rails attach. I just put a couple little drops of oil onto the rail near the ends and tip the bike so the oil runs into the ends.

    Travis.

  10. #10
    stink noodle
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    Quote Originally Posted by Binaural View Post
    By coincidence, I did this last week. I got the frame custom made for me about 5 years ago, and I though it was about time for a clean and inspection to make sure that nothing was going wrong. All in good order, as you'd expect given the visual quality of the welds.
    test.jpg
    All I'm seeing is pressfit bottom bracket...

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