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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 12-01-11, 03:16 PM   #1
DviousDave
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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?
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Old 12-01-11, 03:39 PM   #2
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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.
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Old 12-01-11, 03:53 PM   #3
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Thx. I should be good then since I'll be using a Formula hub or something rebranded.
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Old 12-12-11, 06:09 PM   #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 06:13 PM.
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Old 12-12-11, 06:13 PM   #5
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If it's 68x110mm, you're good.
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Old 12-12-11, 06:15 PM   #6
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Yes it is. Gracias Scrod.
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Old 12-12-11, 06:16 PM   #7
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I was more confused about the tapering.
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Old 12-12-11, 06:17 PM   #8
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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.
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Old 12-12-11, 06:24 PM   #9
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Free knowledge. I love it.
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Old 12-12-11, 06:29 PM   #10
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I was more confused about the tapering.
Oh right on. Yeah, the UN55 has a JIS taper so you're all set.
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Old 12-12-11, 06:32 PM   #11
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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.
How does one figure out what chainline you'll have based on your hubs?

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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.
Oh crap, this is a TIL for me. I definitely greased mine lol. D'oh.
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Old 12-12-11, 06:35 PM   #12
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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).

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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.
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Old 12-12-11, 06:40 PM   #13
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What is the proper torque?
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Old 12-12-11, 06:50 PM   #14
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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?
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Old 12-12-11, 06:52 PM   #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.
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Old 12-12-11, 06:53 PM   #16
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proper torque force for the part is useless without a torquimeter amiright?
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Old 12-12-11, 06:58 PM   #17
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My mind is a torquemeter.
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Old 12-12-11, 07:02 PM   #18
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My mind is a torquemeter.
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Old 12-12-11, 07:04 PM   #19
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Old 12-12-11, 08:18 PM   #20
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Torque = 485 - 608 in lbs
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Old 12-12-11, 09:03 PM   #21
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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.
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Old 12-12-11, 09:04 PM   #22
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Torque = 485 - 608 in lbs
That seems a bit high. I use 33 ft-lbs (400 in-lbs) on all my square taper cranks.
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Old 12-13-11, 07:32 AM   #23
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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?
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Old 12-13-11, 07:45 AM   #24
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hahaha
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Old 12-13-11, 07:58 AM   #25
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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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