Advertise on Bikeforums.net



User Tag List

Results 1 to 12 of 12
  1. #1
    Fail Boat crewman
    Join Date
    Feb 2011
    Location
    PDX
    My Bikes
    Reynolds 853 Jamis Quest 1990s
    Posts
    674
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Carbon fiber torque specs

    I am considering a carbon frame (Calfee) to replace my steel frame (853 Reynolds Jamis).

    I understand that torque specs on bolts must be adhered to, but where can I find those?

    I have checked individual sites and have not been able to find them.

  2. #2
    Certified Bike Brat Burton's Avatar
    Join Date
    Jan 2011
    Location
    Montreal, Quebec
    Posts
    4,203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    So what bolts are we talking about exactly? Your headset seats, bottom bracket inserts, seatpost collar mount and rear dropouts should all be metal and the items installed there will all have their own torque load specifications.

  3. #3
    Fail Boat crewman
    Join Date
    Feb 2011
    Location
    PDX
    My Bikes
    Reynolds 853 Jamis Quest 1990s
    Posts
    674
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Burton View Post
    So what bolts are we talking about exactly? Your headset seats, bottom bracket inserts, seatpost collar mount and rear dropouts should all be metal and the items installed there will all have their own torque load specifications.
    All please. I have one torque wrench that starts at 10Nm. I am sure I will need a smaller wrench for the smaller bolts.

  4. #4
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,292
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by I_like_cereal View Post
    All please. I have one torque wrench that starts at 10Nm. I am sure I will need a smaller wrench for the smaller bolts.
    Yes you will.

    In fact, for most 1 1/8 carbon steerers and 31.8 stems it'll be 5nm for stem faceplate bolts and 5nm for steerer bolts. Seatpost collar is generally 5nm+ as well. You will also need carbon compound to install post and optional for stem.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  5. #5
    Certified Bike Brat Burton's Avatar
    Join Date
    Jan 2011
    Location
    Montreal, Quebec
    Posts
    4,203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by I_like_cereal View Post
    All please. I have one torque wrench that starts at 10Nm. I am sure I will need a smaller wrench for the smaller bolts.
    OK so now that its clear we`re talking about components other than the frame - torque values will vary slightly from manufacturer to manufacturer but in most cases they`ll be neatly etched or stensiled on the component so it`ll be easy to reference.

    The tech documents for anything you`re interested in should also be available from the component manufacturer.

  6. #6
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
    Posts
    9,032
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    I broke the cf steer tube on an $850 fork because I used the torque spec shown on the stem, too much for the steer tube. I'd say that 5 nm is the upper limit for cf.

  7. #7
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    39,185
    Mentioned
    20 Post(s)
    Tagged
    0 Thread(s)
    Mr Calfee will be the expert in this regard..

    Seems Carbon Fiber stuff in amateur hands
    is a problem waiting to happen..

    but thats from reading this list..

    NB , Torque wrenches are needing recalibration, occasionally .

    I think Snap On, as a source for professional mechanics does an exchange
    for freshly checked ones, for the Motor trade..
    Last edited by fietsbob; 05-12-11 at 02:08 PM.

  8. #8
    Elitist Troglodyte DMF's Avatar
    Join Date
    Jun 2006
    Location
    Dallas
    My Bikes
    03 Raleigh Professional (steel)
    Posts
    6,887
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fietsbob View Post
    NB , Torque wrenches are needing recalibration, occasionally.
    Why? if the spec tolerances are 25% (as nearly all are on bikes)? This is not worth worrying about, IMO.

    Personally, I've never seen one wander as much as 1%.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  9. #9
    Certified Bike Brat Burton's Avatar
    Join Date
    Jan 2011
    Location
    Montreal, Quebec
    Posts
    4,203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Now that I think about it - the Park Tool Big Blue Book of Bicycle Repair (the one advertised on this site that many members here seem to avoid buying) has several appendix in the back of the book. Appendix C covers most common torque values and seperates components by area, as well as detailing torque values by specific manufacturer and item model. Its not absolutely complete - but would be a good start. The same info is probably available on the PT website.

    As well as a torque wrench - good reading skills help. Torque values can be specified as MAX / MIN / or BETWEEN. It always helps to follow instructions.

  10. #10
    Senior Member
    Join Date
    Mar 2007
    Posts
    160
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've found this to be a handy tool:

    http://www.ritcheylogic.com/dyn_prod...52-100&k=97993

  11. #11
    Senior Member
    Join Date
    Jul 2010
    Posts
    142
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by operator View Post
    Yes you will.

    In fact, for most 1 1/8 carbon steerers and 31.8 stems it'll be 5nm for stem faceplate bolts and 5nm for steerer bolts. Seatpost collar is generally 5nm+ as well. You will also need carbon compound to install post and optional for stem.
    What is carbon compound, and what does it do? Do you need to re-apply it when you adjust your seat height?

  12. #12
    Fail Boat crewman
    Join Date
    Feb 2011
    Location
    PDX
    My Bikes
    Reynolds 853 Jamis Quest 1990s
    Posts
    674
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Carbon compound is a grease that allows the carbon parts to "stick" to each other lest they slide.

Posting Permissions

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