Advertise on Bikeforums.net



User Tag List

Results 1 to 14 of 14
  1. #1
    Senior Member
    Join Date
    Jul 2007
    Location
    San Jose, Ca
    My Bikes
    09 Specialized Tricross Sport
    Posts
    1,213
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    installing shimano external bearing cranksets to torque spec?

    I want to install a Shimano external bearing crankset, the 5603 set, according to Shimano's instructions. I want to use a torque wrench to tighten the cups on each side of the bottom bracket which I understand I can do if I use Park Tool BBT-19. My problem is that I don't see how I can use Shimano TL-FC 16 given that there is no hex-shaped fitting on the back of the thing.

    Shimano tells us to torque the thing to 0.7-1.5 N-m/6-13 in lbs but I don't see how anyone is supposed to torque it so precisely without a fitting for a torque wrench.
    FOR SALE:
    NEW Ritchey Pro 27.2 x 350 x 25mm-offset seatpost
    NEW Dura Ace 7703 9-speed triple 28.6 front derailleur
    USED Ritchey Pro 30deg 110 x 31.8 stem
    USED Specialized Comp 20-28deg 110 x 31.8 adjustable stem

  2. #2
    Senior Member
    Join Date
    Jul 2007
    Location
    San Jose, Ca
    My Bikes
    09 Specialized Tricross Sport
    Posts
    1,213
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Oops, I just saw this.

    Has anyone used it? Is it a durable tool? With some 305-435 in lbs of torque going through it, it had better be.

    Another question, when I install the cups, do I torque both sides to spec or only the right side? Right side first, then left side?
    Last edited by thirdin77; 01-29-09 at 01:17 AM.
    FOR SALE:
    NEW Ritchey Pro 27.2 x 350 x 25mm-offset seatpost
    NEW Dura Ace 7703 9-speed triple 28.6 front derailleur
    USED Ritchey Pro 30deg 110 x 31.8 stem
    USED Specialized Comp 20-28deg 110 x 31.8 adjustable stem

  3. #3
    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
    25,972
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by thirdin77 View Post
    Another question, when I install the cups, do I torque both sides to spec or only the right side? Right side first, then left side?
    Both sides and it doesn't matter which is first. The cups don't touch each other so they aren't like a cartridge bb.

  4. #4
    Member deweyhtucker's Avatar
    Join Date
    Jan 2009
    Location
    Dandridge, TN
    My Bikes
    A new Cadillac AVSL Adventure Series Comfort Bike, and a used 1996 Trek 5000 OCLV 8 Speed Bike with the original Shimano 105SC Component Group.
    Posts
    40
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    16" in Lbs is snug. Get your torque wrench and apply a small cresent wrench to the 3/8 drive end, and you will see how light the presure is for a 13 to 16 in Lbs torque.

  5. #5
    Senior Member
    Join Date
    Dec 2004
    Posts
    166
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Put some anti-seize on the threads (if they are new they should already have some) and tighten them down with a good amount of pressure, but don't go He-man on them. The external bearings are pretty idiot proof and torque shouldn't be all that much of an issue.


    It is far more important to have the proper torque on the locking bolts on the crank arm because you can strip them out pretty bad and ruin the crank. I have seen it happen 2 times this past year.

  6. #6
    Recreational Commuter
    Join Date
    Apr 2006
    Location
    Central Ohio
    My Bikes
    Two brand-less build-ups.
    Posts
    1,001
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by thirdin77 View Post
    Oops, I just saw this.

    Has anyone used it? Is it a durable tool? With some 305-435 in lbs of torque going through it, it had better be.
    Er...no. 435 inch pounds = 36.35 foot pounds = Not much at all.

    It could be made out of plastic and if it's used properly would stand up for a long time.
    Riding the Ohio MS Central Ohio Challenge tour, July 12th.

  7. #7
    Senior Member
    Join Date
    Dec 2004
    Posts
    166
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    BTW shimanos instructions are written by Engineers, while being very good most of the time, can be overly technical. 16lbs of tork is a Engineers way of saying, tighten down hard.

  8. #8
    Senior Member Shimagnolo's Avatar
    Join Date
    May 2008
    Location
    Zang's Spur, CO
    Posts
    6,423
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by thirdin77 View Post
    Oops, I just saw this.

    Has anyone used it? Is it a durable tool? With some 305-435 in lbs of torque going through it, it had better be.

    Another question, when I install the cups, do I torque both sides to spec or only the right side? Right side first, then left side?
    You are confusing apples and oranges.

    BBT-19 is for torquing the bearing cups into the frame at 36 ft-lbs.

    TL-FC 16 is for preloading the bearings before clamping the left crank arm onto the shaft. It serves exactly the same function as the bolt in the cap of a threadless headset which preloads the headset bearings before clamping the stem. Very little torque is needed.

  9. #9
    Senior Member Shimagnolo's Avatar
    Join Date
    May 2008
    Location
    Zang's Spur, CO
    Posts
    6,423
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Kotts View Post
    Er...no. 435 inch pounds = 36.35 foot pounds = Not much at all.

    It could be made out of plastic and if it's used properly would stand up for a long time.
    On what planet???

  10. #10
    Senior Member
    Join Date
    Oct 2005
    Posts
    5,437
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You can use a fish scale to very accurately get 16 in-lbs. Attach the fish scale to the non business end of the tool. Measure the distance in inches from the center of the business end of the tool to the point of attachment of the fish scale. Now divide 16 in-lbs by the distance you measured above and that gives you the amount of pounds to pull on the fish scale to get the proper torque.
    Il faut de l'audace, encore de l'audace, toujours de l'audace

    1980 3Rensho-- 1975 Raleigh Sprite 3spd
    1990s Raleigh M20 MTB--2007 Windsor Hour (track)
    1988 Ducati 750 F1

  11. #11
    Senior Member
    Join Date
    May 2005
    Location
    Terre Haute, Lafayette, or Indianapolis, IN, depending on the day
    My Bikes
    n, I would like n+1
    Posts
    1,917
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Shimagnolo View Post
    On what planet???
    This one?
    435in*lb|1 foot = 435/12 ft-lbf = 36.25 ft-lbf.
    _______|12 in

    edit: so he's off by 0.1 ft-lbf, he probably hit the 3 going for the 2.

  12. #12
    Senior Member
    Join Date
    May 2005
    Location
    Terre Haute, Lafayette, or Indianapolis, IN, depending on the day
    My Bikes
    n, I would like n+1
    Posts
    1,917
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by fixedmonkey View Post
    BTW shimanos instructions are written by Engineers, while being very good most of the time, can be overly technical. 16lbs of tork is a Engineers way of saying, tighten down hard.
    Yep, it's like when car manuals tell you what torque to put your spark plugs in with. It's the technical way to say "Snug, and just a tiny bit further."

  13. #13
    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
    25,972
    Mentioned
    10 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by jccaclimber View Post
    This one?
    435in*lb|1 foot = 435/12 ft-lbf = 36.25 ft-lbf.
    _______|12 in

    edit: so he's off by 0.1 ft-lbf, he probably hit the 3 going for the 2.
    It wasn't the in-lb to ft-lb conversion that caused the question, it's the statement that 36 ft-lb isn't much torque. Get a torque wrench and tighten something to that value. See if you still think it isn't much.

  14. #14
    Senior Member
    Join Date
    May 2005
    Location
    Terre Haute, Lafayette, or Indianapolis, IN, depending on the day
    My Bikes
    n, I would like n+1
    Posts
    1,917
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by HillRider View Post
    It wasn't the in-lb to ft-lb conversion that caused the question, it's the statement that 36 ft-lb isn't much torque. Get a torque wrench and tighten something to that value. See if you still think it isn't much.
    It's a lot for a tiny fastener, it's nothing for a large one. My torque wrench goes to ~140 ft-lbf and I run into stuff for which that isn't enough sometimes, although I will openly admit that 120 ft-lbf is a lot of torque. On the other hand, I'm not built like the T-rex road cyclist either.

Posting Permissions

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