Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    Senior Member various styles's Avatar
    Join Date
    Mar 2012
    Location
    Sacramento,CA
    Posts
    170
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Tightening crank arms

    So i"m about to tighten my crank arms with a torque wrench. Once i tighten my bolt to were putting some real torque is required, and my crank arm is at 6 o'clock and my ratchet is at 12 o'clock . How far do i turn the ratchet to the crank arm 1/4 1/2 3/4 of full circle. I got these cranks http://www.vueltausa.com/components/...et-silver.html there was no torque specs on crank arms

  2. #2
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    26,130
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    I put the torque wrench and the crank arm about 90 apart when applying significant torque to the wrench while holding the crank arm with my other hand.

  3. #3
    Senior Member various styles's Avatar
    Join Date
    Mar 2012
    Location
    Sacramento,CA
    Posts
    170
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    And then meet in the middle?

  4. #4
    Senior Member
    Join Date
    Sep 2004
    Location
    boston, ma
    Posts
    2,840
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    for the non drive arm i lockout my elbow on my left arm on the drive side crank then reach over the bike and tighten with my right hand. for the drive crank i put the chain and wheel on and hold the rear wheel with my left hand and tighten with right hand

  5. #5
    Senior Member various styles's Avatar
    Join Date
    Mar 2012
    Location
    Sacramento,CA
    Posts
    170
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Alright thanks!

  6. #6
    Senior Member
    Join Date
    Mar 2008
    Posts
    4,380
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by various styles View Post
    So i"m about to tighten my crank arms with a torque wrench. Once i tighten my bolt to were putting some real torque is required, and my crank arm is at 6 o'clock and my ratchet is at 12 o'clock . How far do i turn the ratchet to the crank arm 1/4 1/2 3/4 of full circle.
    Huh?
    If you have a torque wrench, you shouldn't be asking about how far to turn, the tool will tell you.
    Either you'll have a beam style torque wrench, in which case you just turn until the dial indicates the right value. Or you have the ratcheting, click-type wrench in which case you simply turn until you hear/feel it click.

    Sometimes angle of displacement, or bolt elongation is used in determining that something is correctly tightened. But that's at far bigger things than bike parts.

    Quote Originally Posted by various styles View Post
    I got these cranks http://www.vueltausa.com/components/...et-silver.html there was no torque specs on crank arms
    Seems to be a dead standard square taper. Park has a torque recommendation chart, scroll down about 1/4. 305-391 inch-pound.

  7. #7
    Senior Member
    Join Date
    Feb 2009
    Posts
    4,143
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    I shoot for 25 foot-pounds.

  8. #8
    Senior Member Bat56's Avatar
    Join Date
    May 2010
    Location
    St.Paul, MN
    Posts
    1,664
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by dabac View Post
    Huh?
    If you have a torque wrench, you shouldn't be asking about how far to turn, the tool will tell you.
    Either you'll have a beam style torque wrench, in which case you just turn until the dial indicates the right value. Or you have the ratcheting, click-type wrench in which case you simply turn until you hear/feel it click.

    Sometimes angle of displacement, or bolt elongation is used in determining that something is correctly tightened. But that's at far bigger things than bike parts.



    Seems to be a dead standard square taper. Park has a torque recommendation chart, scroll down about 1/4. 305-391 inch-pound.
    all this.

  9. #9
    Senior Member
    Join Date
    Apr 2006
    Posts
    1,024
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    A torque wrench can be dangerous. It is tempting to check the torque on the crank bolts after riding it just to see if the torque has changed. If you check you will see that the torque has decreased and the bolt needs tightening. If you continue to retorque the bolt you will end up damaging the crank arm and maybe even splitting the hole in the crank arm.

    So torque the crank arm bolt to the correct torque and forget it until you need to pull the crank again.

  10. #10
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    26,130
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by various styles View Post
    And then meet in the middle?
    Yes, and if it does I just reposition the wrench as needed. What is so dfifficult about this?

Posting Permissions

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