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  1. #1
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    seat keeps slipping down roughly half an inch

    Hello,

    my seat post keeps slipping down a bit. i've tightened it as hard as i can....it takes a small allen key that i can't get a lot of torque from.

    it's a carbon seat post and a carbon frame so i'm scared of tightening it too much.

    clearly i need a torque wrench.... a couple questions.

    what is a good torque wrench to get?

    how come every torque wrench i've seen online is a socket wrench? my fastener takes a small allen key.

    thanks.
    2009 LOOK 566 Ultegra
    2008 Trek 1.2 wsd triple

  2. #2
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    are you using carbon assembly paste on the post? for torque wrenches i like dial or open beam type for the stems and seatposts. i have a sturtevant open beam. hex bit sockets are available from many manufacturers and fit right on the torque wrench

  3. #3
    Senior Member JTGraphics's Avatar
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    Always use carbon assembly paste on carbon parts and you will have no need to over tighten bolts.

    http://www.qbike.com/cgi-bin/find.cg...assembly+paste
    It may not be fancy but it gets me were I need to go.
    http://www.jtgraphics.net/cyclist_bicycles.htm

  4. #4
    cab horn
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    Quote Originally Posted by Cowboy905 View Post
    Hello,

    my seat post keeps slipping down a bit. i've tightened it as hard as i can....it takes a small allen key that i can't get a lot of torque from.

    it's a carbon seat post and a carbon frame so i'm scared of tightening it too much.

    clearly i need a torque wrench.... a couple questions.

    what is a good torque wrench to get?

    how come every torque wrench i've seen online is a socket wrench? my fastener takes a small allen key.

    thanks.
    It'll most likely be a 4mm or 5mm seat collar he's tightening. In which case, it is definitely possible that it is already damaged from overtorquing. And what #2 said, use carbon assembly paste, in addition to double checking that the post is actually the right size for the bike. e.g. 27.2 and 27.0 looks awfully close.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  5. #5
    Senior Member 009jim's Avatar
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    Warren & Brown make great torque wrenches. You can convert from socket to allen key by buying the socket of the same hex size as the allen key.

  6. #6
    smitten by саша pwdeegan's Avatar
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    Quote Originally Posted by operator View Post
    It'll most likely be a 4mm or 5mm seat collar he's tightening. In which case, it is definitely possible that it is already damaged from overtorquing. And what #2 said, use carbon assembly paste, in addition to double checking that the post is actually the right size for the bike. e.g. 27.2 and 27.0 looks awfully close.
    mis-matched seatpost diameter would be my guess, too. or is there something else, e.g., you are a clyde *and* the allen wrench's handle you are using is only 5mm long off the center?
    No slogans, just 14 facts.

  7. #7
    Senior Member MudPie's Avatar
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    Quote Originally Posted by Cowboy905 View Post
    Hello,


    clearly i need a torque wrench.... a couple questions.

    what is a good torque wrench to get?

    how come every torque wrench i've seen online is a socket wrench? my fastener takes a small allen key.

    thanks.

    A torque wrench is a good investment, but make sure you get one that has the range you need. Do a survey of the fasteners and take note of the recommended torque. As with most tools, price is proportional to quality. Those who wrench a lot often don't use torque wrenches because they've developed the feel with experience. Personally, I use one. I've been eye-ing this wrench and it come with 6 hex bit sockets:
    http://www.artscyclery.com/descpage-SHTW.html

    Also, these hex bit sockets adapt the square drive on a torque wrench or socket handle to the fastener. You'll need to match the drive of the wrench to the drive of the socket. I use these hex bit sockets almost exclusively in my workshop. When mated to a socket handle or driver, it makes wrenching nice.
    http://community.craftsman.com/Craft...-Drive-reviews

  8. #8
    total Newbie
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    thanks guys. i don't think it's damaged as i've been tightening it with a smell hex key, it's pretty tough to get the strength to over tighten it with such a small key. As for the post size, i imagine it should be the proper size, i bought the bike new fully built already.

    thanks for all your help.
    2009 LOOK 566 Ultegra
    2008 Trek 1.2 wsd triple

  9. #9
    total Newbie
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    hello, two more questions.

    i'm looking to add a Torque Wrench to my Xmas List ( tis the season). i've looked at my bike and it says "max torque 70kgf-cm" what does that mean? is that 70kilograms?

    i need to know what to shop for.

    also, with the carbon paste, is that a glue? what if i one day needed to adjust the saddle height and the paste is on, would i have trouble?

    thanks everyone.
    2009 LOOK 566 Ultegra
    2008 Trek 1.2 wsd triple

  10. #10
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    It means ....Kilogram-force per square centimetre

    U need a torque wrench in inches or cm to start with.

  11. #11
    Senior Member MudPie's Avatar
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    Quote Originally Posted by Cowboy905 View Post

    i'm looking to add a Torque Wrench to my Xmas List ( tis the season). i've looked at my bike and it says "max torque 70kgf-cm" what does that mean? is that 70kilograms?

    .
    70 kgf-cm means apply "70 kg of force at 1 cm distance".
    It's confusing since force in the metric system is expressed in Newtons (N) and it's more common to see torque expressed as "xx N-m", which means apply "xx N at a 1m distance."

    Note, 1 kg-f = 9.81N.

    Then 70 kgf-cm = 686.7 N-cm = 6.867 N-m. Thus you will need a torque wrench that can measure up to 6.867 N-m.

    Here's an easy to use conversion web site: http://www.onlineconversion.com/torque.htm

    By the way, check all the fasteners and see the range of torque values. IIRC, the highest torque value I have is 40 N-m. If you're lucky, one wrench will cover all the fasteners.

  12. #12
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    Have a friend that runs a bike shop and swears by these. He tries to sell one to each customer that buys a Trek frame with an aerodynamic seat mast. At $114 per seat mast it is a money saver.

    http://www.ritcheylogic.com/dyn_prod.php?p=05-252-100

    t448_28bdc799dfb78&#.jpg
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