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  1. #1
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    Bike Saddle came off my seatpost.

    Hello.

    I have a trek 7.2 Fx I use for daily commuting and a little while back the saddle started twisting on it. I thought it was the seat tube that was loose and tightened it but the problem didn't go away. Anyway today I was messing around with it trying to find a way to tighten the saddle onto the tube and the top mounting section of the seat tube just popped right off (the whole top of the seat tube that holds the saddle.) I cant find any kind of clamp or mounting mechanism and it fits back onto the seat post but is very loose and just twists around on the tube.

    Hope that makes it clear, I could take a picture if that would help. Any ideas on how to fix this?

  2. #2
    Quirky Grifter LesterOfPuppets's Avatar
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    Happened to me a little while ago. I sanded both sides of the interface, wiped 'em down with 90% isopropyl then glued with JB Weld. Let cure for a couple of days just to make sure. Worked like a charm.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  3. #3
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    Thanks, I'll try that.

  4. #4
    Faster but still slow slowandsteady's Avatar
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    Personally I would just buy a new seat post. I wouldn't trust my butt or my life to JB weld and a defected seat post.
    "Ride lots." -- Eddy Merckx

  5. #5
    Quirky Grifter LesterOfPuppets's Avatar
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    In the case of my seatpost the head was glued on originally, the glue just failed after about 10 years. Unless you're doing some stunt riding or something like that, your butt is never in any danger. When the glue fails, the head simply spins in the post.

    I have a feeling my sanded and JB Welded interface will hold up better than the original glue job.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  6. #6
    Faster but still slow slowandsteady's Avatar
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    Quote Originally Posted by LesterOfPuppets View Post
    In the case of my seatpost the head was glued on originally, the glue just failed after about 10 years. Unless you're doing some stunt riding or something like that, your butt is never in any danger. When the glue fails, the head simply spins in the post.
    I would just hate for my seat post to fall apart at 40 mph in traffic. Even if all it does is spin, at a high speed you are going to be unstable and it would be dangerous.
    "Ride lots." -- Eddy Merckx

  7. #7
    Quirky Grifter LesterOfPuppets's Avatar
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    I rode it for about two weeks 8 miles a day before fixing mine. I never felt unstable. Really just an annoyance. I'd imagine over the long run the interface would've loosened up as a result of wear. I'd bet after a year or so in grimy conditions the head would've become loose enough to pop out while standing to bunnyhop a pot hole or roll over some cobbles.

    Fix or replace before that happens and all will be well. Dunno how many months I've on my JB Welded post, but it's holding up fine.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

  8. #8
    coprolite fietsbob's Avatar
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    there may have been a pin to hold the 2 pieces together, pin , probably aluminum sheared off..

    someone with similar issue last month also wrote on their situation, showed a picture..

  9. #9
    ¡Senor Member! time bandit's Avatar
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    just buy a new seatpost. i've only ever had this happen while trying to twist a seized seatpost out in a vice. I would not trust lesters jb-weld job. you're just asking for it...

  10. #10
    Quirky Grifter LesterOfPuppets's Avatar
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    Quote Originally Posted by fietsbob View Post
    there may have been a pin to hold the 2 pieces together, pin , probably aluminum sheared off..
    someone with similar issue last month also wrote on their situation, showed a picture..
    That was likely me. The pin in my case didn't go through the post. It was simply there for a spring that kept the bottom "cradle" of the micro-adjust with the seatpost head when changing saddles. Without it changing a saddle would be a two person operation.
    1980ish Free Spirit Sunbird fixed * 1996 Mongoose IBOC Zero-G * 1997 KHS Comp * 1990-ish Scapin * Lemond Buenos Aires Triple

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