Advertise on Bikeforums.net



User Tag List

Results 1 to 12 of 12
  1. #1
    Senior Member
    Join Date
    Jun 2008
    Location
    Portland, OR
    My Bikes
    Surly LHT set up for commuting
    Posts
    643
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Seatpost slowly lowering

    I have noticed that my seatpost slowly lowers itself (~1") over the course of a week or so of commuting. I weight ~275lbs and ride a stock LHT (as far as the seatpost tube is concerned). The local shop used grease in the tube as a protectant for the steel frame. The post is held in place via an allen bolt collar (torqued to correct spec). Any thoughts? Should I remove the grease where I'm trying to clamp? Yes, I know grease is slippery but I'm also concerned about developing rust inside my frame. Is this a Clyde issue where we just need to adjust saddle height every so often? Thanks!

  2. #2
    Senior Member
    Join Date
    Apr 2010
    Posts
    103
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    you can always place a thin strip of duct tape just above the seattube-seatpost junction. it will provide extra resistance to the seat lowering

  3. #3
    Senior Member
    Join Date
    Dec 2009
    Location
    Mountain View, CA
    My Bikes
    2012 Scott CR1 Comp
    Posts
    1,240
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I would expect that when you grease up that area, you have to increase the torque to prevent the slippage. Unless you leave your bike in the rain, or commute in the rain and never dry it off or clean it, there shouldn't be excessive concern about rust.

  4. #4
    Senior Member breadbin's Avatar
    Join Date
    Jul 2006
    Location
    West of Ireland
    My Bikes
    Raleigh 531c, Marin Muirwoods, Brodie Romax
    Posts
    640
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    no leave the grease cos thats what stops it welding itself to the frame!! seriously. you can get shims to fit your seatpost to get more grip or even make your own from a coke can
    http://www.flickr.com/photos/evildiesel
    October miles=18/100

  5. #5
    Downtown Spanky Brown bautieri's Avatar
    Join Date
    May 2007
    Location
    Camp Hill, Pennsyltucky
    My Bikes
    07 Raliegh Grand Sport 98ish Mongoose Manuever
    Posts
    2,099
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You could use a shim like Breadbin mentioned or you could just give that allen bolt another half turn to the right

  6. #6
    Senior Member jboyd's Avatar
    Join Date
    Jul 2007
    Location
    Southern Illinois
    My Bikes
    Giant "Rainier"
    Posts
    784
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I had the same issue on my last frame. All I did was get one of those cheap seat post reflectors and set it at the union. It does not take much to stop that lowering.
    http://www.homeairdirect.com Hey! It's What I Do

  7. #7
    Senior Member
    Join Date
    Jun 2008
    Location
    Portland, OR
    My Bikes
    Surly LHT set up for commuting
    Posts
    643
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks everyone, I'll start with the tape trick and go from there. I -do- commute in the rain so I want to keep the protection :-).

  8. #8
    I am the Snail~! Peter_C's Avatar
    Join Date
    Sep 2009
    Location
    Near Akron, Ohio
    My Bikes
    2010 TerraTrike Rover 8
    Posts
    1,583
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If not too late, might I suggest instead?

    Black 'friction' tape (AKA Electrition's tape) one tight loop so it will slide *inside* just enough so the tape does not show? Even the cheap plastic tape ought to do the trick for you. More binding than metal on metal, or, metel on lubed metal.

    Just my $0.02 worth
    HTH
    Peter_C
    http://s1103.photobucket.com/albums/g475/Peter_CC/ <-- My Photos

  9. #9
    Senior Member rockdog's Avatar
    Join Date
    Jul 2008
    Location
    Kalamazoo, MI USA
    My Bikes
    Co-Motion Americano - LBS Build, 90something Fuji Sunfire hybrid
    Posts
    102
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You said it was an LHT? I'd contact the guys at Surly and ask their advice. And check out this post on their website.

  10. #10
    Senior Member
    Join Date
    Jun 2008
    Location
    Portland, OR
    My Bikes
    Surly LHT set up for commuting
    Posts
    643
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Surly also sells a super-duper seatpost clamp meant for heavier riders and MTB use.

    Thanks for the link rockdog, I will try the tips in that article.

  11. #11
    billyymc
    Guest
    I had the same issue with the carbon seatpost on my Tricross Comp. I just tightened it up until it didnt' slide anymore. Didnt have a torque wrench...been ok for 2k miles.

  12. #12
    Senior Member
    Join Date
    Aug 2009
    Location
    Mandan, ND
    My Bikes
    Specialized Sectuer Comp Specialized Rockhopper Comp
    Posts
    68
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Had the same problem with the carbon seatpost on my Sectuer Comp. Just tightened the crap out of it and it stopped moving.
    2010 Specialized Sectuer Comp
    1996 Specialized Rockhopper Comp

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •