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PostPosted: Sun Nov 25, 2012 7:48 pm 
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Joined: Wed Nov 21, 2012 3:05 am
Posts: 256
i am also interested in the extralite octaramp chainrings, how is the shifting terzuya? i did not see where you posted about the shifting? i looked through it twice but i could not find it.


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PostPosted: Mon Nov 26, 2012 6:02 am 
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Joined: Sat May 12, 2012 8:32 am
Posts: 602
Location: Adelaide, Australia
Mackers wrote:
I can imagine the 11S front derailleur working slightly better with the intended spacing.


What is the spacing on the new red crank? Would it be possible to shave a bit of my rings to make it narrower?

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PostPosted: Mon Nov 26, 2012 9:08 am 
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Joined: Tue Apr 22, 2008 4:31 am
Posts: 236
Just got my BB30 Compact crank , 175mm in the mail today.

529g with the std rings.

Have the Praxis rings ready to go, so will check out the full weight a bit later, and add some pics too.

Just weighed all the bits separately and then with the Praxis rings, the crankset tips the scales at 491g :mrgreen: :mrgreen: :mrgreen: :mrgreen:

One minor issue though (need a pic later) that when the Praxis outer ring is installed, the inner edge when it mates with the hidden bolt on the crankarm needs to be trimmed ever so slightly - has anyone else struck this problem ? The std SRAM ring obvious;y doesn't have this issue.


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PostPosted: Tue Nov 27, 2012 8:38 am 
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Joined: Tue Apr 22, 2008 4:31 am
Posts: 236
Now for some pics

BB30 Comapct 175mm crank - std

Image

Now issue with Praxis rings not quite fitting on the hidden bolt cutout.

First the std rings
Image

Now the Praxis rings
Image

It seems that the profile of the cahinring bolt area (square rather than chamfered) is the issue.

Has anyone else seen this or noticed this when fitting.

A quick lick of the file is probably all that is needed, but thought I'd check first.

Thanks in advance

Michael B

Edited to get rid of monster image. Bloody computers ...


Last edited by MichaelB on Wed Nov 28, 2012 9:01 am, edited 1 time in total.

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PostPosted: Tue Nov 27, 2012 6:44 pm 
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Joined: Tue Jun 08, 2010 4:58 am
Posts: 257
Location: Chicago
I didn't have to file mine.


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PostPosted: Tue Nov 27, 2012 6:58 pm 
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Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8292
Location: Los Angeles / Glendale, California
Now I see what you were referring to!

I didn't have to file mine either.
Are you sure that you have that ring facing the correct side? (maybe flip it?)
Barring that, and if everything is facing the correct side and rotated as you need to, it may be just a manufacturing hiccup that you encountered... and if that is the case, some minor filing wouldn't damage the ring.

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PostPosted: Tue Nov 27, 2012 9:56 pm 
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Joined: Tue Oct 23, 2012 5:02 pm
Posts: 63
I've got the same issue with non-original chainring. I think it's a bb30/gxp thing. Ie anything will fit on the GXP whereas the BB30 might have issues with some chainrings.

Edit:
The BB30 has a 'groove' in the crankarm (as per MichaelB's pic). The GXP has some added material on the crankarm to mount the chainring on:
Image

I wonder if user CBRE did some modding on the various chainrings he used on his BB30 Sram Exogram crank (see the beginning of the thread).


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PostPosted: Tue Nov 27, 2012 10:59 pm 
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Joined: Tue Jun 08, 2010 4:58 am
Posts: 257
Location: Chicago
It could also be a compact issue. My crank is bb30/standard and I didn't have to file anything.


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PostPosted: Tue Nov 27, 2012 11:03 pm 
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Location: Los Angeles / Glendale, California
More specifically, it seems like it is a BB30 + Compact specific issue, perhaps related to the Q-factor/angle the arm has to be at because of the BB30 specs.

BB30/Standard = OK
BB30/Compact = a little bit of filing. :?:
GXP/Standard = OK
GXP/Compact = OK

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PostPosted: Tue Nov 27, 2012 11:24 pm 
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Joined: Tue Oct 23, 2012 5:02 pm
Posts: 63
The "compact bb30-hypothesis" certainly makes sense when thinking about it. My fit issue is on a compact BB30 as well (when combining with a Stronglight CT2 chainring).


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PostPosted: Wed Nov 28, 2012 3:57 am 
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Joined: Tue Apr 22, 2008 4:31 am
Posts: 236
Aha !!

Thanks MagnusH (you pic helped show the difference between compact and non-compact) and prendrefeu, it seems like the issue is noted !!!

So a bit of filing is in order. A chance to remove even more weight !!!!

I'll take some more pics when the job is done and post them up.

Thanks for the help guys :beerchug:


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PostPosted: Wed Nov 28, 2012 4:02 am 
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Joined: Wed Nov 21, 2012 3:05 am
Posts: 256
well that is a bummer because i was looking to do this next week but i have the compact one as well.


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PostPosted: Wed Nov 28, 2012 4:07 am 
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Joined: Wed Nov 21, 2012 3:05 am
Posts: 256
michael can you let me know when you get your set up and running because i would need some help on my side to make sure i do it right. thanks.


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PostPosted: Wed Nov 28, 2012 4:23 am 
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Joined: Tue Apr 22, 2008 4:31 am
Posts: 236
liketoride wrote:
michael can you let me know when you get your set up and running because i would need some help on my side to make sure i do it right. thanks.


Can do.

First job is to strip the logos off the crank. Actually, gotta do a whole pile of other jobs, but happy to help where I can.


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PostPosted: Wed Nov 28, 2012 4:55 am 
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Joined: Sat May 12, 2012 8:32 am
Posts: 602
Location: Adelaide, Australia
Anyone chime in on 11 speed compatibility (especially with Campy)? I've read that the old Red Crank works fine, but supposedly the spacings are different for the new one any info?

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I write the weightweenies blog, hope you like it :)

My SwiftCarbon Ultravox

My Velocite Selene

Disclosure: I'm sponsored by Velocite, but I do give my honest opinion about them (I'm endorsed to race their bikes, not say nice things about them)


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