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  1. #1
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    IRD Defiant quesion \ confusion...

    Description taken off of retro-gression:

    fits JIS square taper bottom brackets (110mm for most set-ups)

    The "most set-ups" part has me scratching my head. I'm buying them to use on my 1st build. It'll be used on the Leader 722 I just bought from retro-gression. Should I be looking for a different size BB or am I lumped into the "most set-ups" category?

  2. #2
    Veteran Bastard Scrodzilla's Avatar
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    It has nothing at all to do with what frame you have.

    As long as you'll be using a rear hub that will give you a 42mm (ish) chainline, you should use a 68mm English-threaded JIS square taper BB with 110mm spindle.

  3. #3
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    Thx. I should be good then since I'll be using a Formula hub or something rebranded.

  4. #4
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    Just picked up a Shimano UN55 to go along with my Defiants. Think I bought the right type but still second guessing myself. Please put me and ease experts.
    Last edited by DviousDave; 12-12-11 at 05:13 PM.

  5. #5
    Veteran Bastard Scrodzilla's Avatar
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    If it's 68x110mm, you're good.

  6. #6
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    Yes it is. Gracias Scrod.

  7. #7
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    I was more confused about the tapering.

  8. #8
    Veteran Bastard Scrodzilla's Avatar
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    No prob.

    When you install them, don't grease the spindle before you put on the arms. You should only grease a splined spindle.

  9. #9
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    Free knowledge. I love it.

  10. #10
    Veteran Bastard Scrodzilla's Avatar
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    Quote Originally Posted by DviousDave View Post
    I was more confused about the tapering.
    Oh right on. Yeah, the UN55 has a JIS taper so you're all set.

  11. #11
    Brown Bear, Sqrl Hunter Jaytron's Avatar
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    Quote Originally Posted by Scrodzilla View Post
    It has nothing at all to do with what frame you have.

    As long as you'll be using a rear hub that will give you a 42mm (ish) chainline, you should use a 68mm English-threaded JIS square taper BB with 110mm spindle.
    How does one figure out what chainline you'll have based on your hubs?

    Quote Originally Posted by Scrodzilla View Post
    No prob.

    When you install them, don't grease the spindle before you put on the arms. You should only grease a splined spindle.
    Oh crap, this is a TIL for me. I definitely greased mine lol. D'oh.
    PedalRoom

    Hey I just met you,
    and this is crazy,
    but here's my Strava,
    follow me maybe.

  12. #12
    Veteran Bastard Scrodzilla's Avatar
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    Quote Originally Posted by Jaytron View Post
    How does one figure out what chainline you'll have based on your hubs?
    Because of variances from one brand of cog to another, there is no actual standard - which is why I said 42(ish).

    Quote Originally Posted by Jaytron View Post
    Oh crap, this is a TIL for me. I definitely greased mine lol. D'oh.
    Clean it off. Greasing a square-taper makes over-torquing the crank arms much easier, which can cause the interface to slide too far onto the spindle and become misshapen.
    Last edited by Scrodzilla; 12-12-11 at 05:39 PM.

  13. #13
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    What is the proper torque?

  14. #14
    Veteran Bastard Scrodzilla's Avatar
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    I'm fairly certain crank arm bolts on Shimano BBs should be somewhere between 310-390 in-lb. Did your cranks or BB come with a tech sheet?

  15. #15
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    The BB did. I'll check it when I get home. All these questions should go into the Ask Scrod post.

  16. #16
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    proper torque force for the part is useless without a torquimeter amiright?

  17. #17
    Veteran Bastard Scrodzilla's Avatar
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    My mind is a torquemeter.

  18. #18
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    Quote Originally Posted by Scrodzilla View Post
    My mind is a torquemeter.

  19. #19
    Veteran Bastard Scrodzilla's Avatar
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  20. #20
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    Torque = 485 - 608 in lbs

  21. #21
    ABQ
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    I used this BB with my new Def crankset:

    http://www.interlocracing.com/bbs.html

    It came with a nice tech sheet with all the numbers you need to know...

    And the price was right, too. That's a nice looking crankset.

  22. #22
    Veteran Racer TejanoTrackie's Avatar
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    Quote Originally Posted by DviousDave View Post
    Torque = 485 - 608 in lbs
    That seems a bit high. I use 33 ft-lbs (400 in-lbs) on all my square taper cranks.
    What, Me Worry? - Alfred E. Neuman

    Quote Originally Posted by Dcv View Post
    I'd like to think i have as much money as brains.

  23. #23
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    Quote Originally Posted by Scrodzilla View Post
    My mind is a torquemeter.
    More like sub-forum Torquemada:



    The grimace is similar, but the hair's a bit off. Scrod, you gonna rock the tonsure any time soon?

  24. #24
    Veteran Bastard Scrodzilla's Avatar
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    hahaha

  25. #25
    Senior Member skadoosh's Avatar
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    I always followed greasing square tapers. Jobst Brandt is in favor of it and his reasons seems to make more sense than the reasons used by those in favor of dry installations.

    http://sheldonbrown.com/brandt/installing-cranks.html

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