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PostPosted: Tue Apr 23, 2013 12:03 am 
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Joined: Mon May 16, 2011 8:14 pm
Posts: 410
Just bought a used Red 2013 crankset to replace my 2012 crank. BB30. The crank came with a plastic clamp-type spacer that clamps onto the BB spindle via a small allen head bolt. I didn't have this on my 2012 crank. What is this for? Do I need this for a BB30 installation on a supersix frame? Seems like this crank also doubles as a PF30 install with some interchangeable parts, want to be sure this clamp isn't for a PF30 install.

Thanks!


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PostPosted: Tue Apr 23, 2013 12:19 am 
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Joined: Tue Jun 08, 2010 4:58 am
Posts: 257
Location: Chicago
It's the preload adjuster.


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PostPosted: Tue Apr 23, 2013 2:45 am 
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Joined: Mon May 16, 2011 8:14 pm
Posts: 410
Thanks. Interesting, I'm not quite sure what that means. I just installed the crank with the 'preload adjuster' on, and left the 3 plastic spacers off that I had on my old setup. Seems to work just fine. The wavy washer has just a smidgen of wave left in it.

Thanks,
Todd


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PostPosted: Tue Apr 23, 2013 3:28 am 
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Joined: Tue Jun 08, 2010 4:58 am
Posts: 257
Location: Chicago
The preload adjuster takes the place of the plastic spacers and wavy washer. Remove those and reinstall the crankset. Tighten down with a 10mm hex, then turn the preload adjuster clockwise until it is snug against the bearing shield. Tighten the 2mm allen head down and you're done.


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PostPosted: Tue Apr 23, 2013 8:57 am 
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Joined: Fri Dec 24, 2010 9:37 pm
Posts: 869
Location: it's raining, it must be uk
^^^this

in the old days sram used a wavy washer with the adjuster, but they stopped that (imho it was easier to adjust when there was the washer)

for full instructions see...

http://cdn.sram.com/cdn/farfuture/lSlIB ... nksets.pdf

start with the adjuster at minimum, then make sure you get enough torque on the 10mm hex (c. 50Nm) *before* tightening the adjuster


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PostPosted: Tue Apr 23, 2013 12:53 pm 
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Joined: Tue Nov 04, 2008 6:44 pm
Posts: 230
Could have just read the instructions really.


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PostPosted: Tue Apr 23, 2013 3:42 pm 
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Joined: Sun Jul 11, 2010 6:58 pm
Posts: 236
Location: MS, USA
The instructions really are not very clear. I just installed one last night (new bb30 red quarq). For example, what is "hand tighten" on the preload adjuster? I can "hand tighten" it enough that it spreads and jumps the threads (obviously not correct, but still within the realm of possibility of hand tightening). I can also just snug it up against the bearing shield, but even then it actually snugs up a little more when you tighten the 2mm allen. It tightens up enough that there is an increase in drag. In the end, I just kept playing with it until I got no lateral play, AND no increased drag once the preload was tightened down. This meant that before tightening the preload it was barely touching the bearing shield. Hardly what I call "tight." Maybe it will develop some play and need to be tightened down some more? Finally, Even after doing all of this, the crank was not perfectly centered in the frame. I had to add a couple of the thin, clear plastic spacers to the DS to get the crank centered.

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PostPosted: Thu Apr 25, 2013 4:23 am 
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Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
You got the gist of "hand tighten". Like almost all bearing systems, you want the adjustment to be as loose as possible without play.
to keep the preload collar from spreading, don't loosen the pinch bolt so much, only enough so you can turn it by hand. that will also make your initial hand adjustment more accurate. The system will not tighten up so much when you finally tighten the clamp screw.


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