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PostPosted: Sat Jul 28, 2012 3:17 am 
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Joined: Sat Jun 13, 2009 4:02 am
Posts: 1969
Location: NoVA/DC
156mm is what sram quotes for their mountain double cranks.


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PostPosted: Sun Jul 29, 2012 12:27 pm 
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Joined: Mon Jan 17, 2011 10:26 pm
Posts: 140
Location: New Zealand
This SRAM Doc ( http://www.sram.com/sites/default/files ... _rev_b.pdf" onclick="window.open(this.href);return false; ) states 145mm for the q factor which fits with the measured 146mm.


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Posted: Sun Jul 29, 2012 12:27 pm 


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PostPosted: Sun Jul 29, 2012 4:00 pm 
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Joined: Wed Feb 02, 2011 3:48 am
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@thisisatest - not all XX cranks are 156mm. There are 3 versions, 156mm, 164mm and 166mm...


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PostPosted: Mon Jul 30, 2012 7:51 am 
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Location: NoVA/DC
Yea- i was going to mention that, decided to not confuse the issue. Never heard of the 166 model though- was it made for one particular company's chubby bike with some junk in the trunk?


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PostPosted: Mon Jul 30, 2012 10:16 pm 
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Joined: Sat Aug 22, 2009 11:44 pm
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pdlpsher1 wrote:
I just put the new Red cranks on my bike today. The old FC-R700 came off (762 g.) and the Red went on (576g.).


Is your crank 50/34 compact version? I've seen 53/39 standart on scale as 607g...


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PostPosted: Tue Jul 31, 2012 5:55 am 
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@thisisatest - I saw the measurements on the SRAM website a while ago. Memory is a bit hazy but have a feeling the 164/166 difference was GXP vs. BB30/PF30 or something like that :noidea:


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PostPosted: Tue Jul 31, 2012 6:37 am 
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Joined: Sat Oct 10, 2009 7:13 am
Posts: 884
Location: 93306
I run a 166 GXP on my mtb. They barely cleared on my old bike (08 Stumpjumper FSR) but there is plenty of clearance on my 2011 Stumpjumper FSR. My friend was rubbing his 156q arms on his SC Blur LTC :idea:


Last edited by tonytourist on Mon Jul 21, 2014 7:42 am, edited 1 time in total.

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PostPosted: Tue Jul 31, 2012 7:18 am 
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Joined: Thu Jul 19, 2012 6:09 pm
Posts: 122
Location: Loveland, CO
Boralb wrote:
pdlpsher1 wrote:
I just put the new Red cranks on my bike today. The old FC-R700 came off (762 g.) and the Red went on (576g.).


Is your crank 50/34 compact version? I've seen 53/39 standart on scale as 607g...


Mine is a compact GXP version. The BB30 compact should be even lighter (~520g. if I recall).

I could really feel the reduction in rotational weight (166g.) I love the new Red crank.


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PostPosted: Wed Aug 15, 2012 2:22 am 
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Joined: Tue Nov 29, 2011 10:07 pm
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terzuya wrote:
The Q factor on my exogram bb30 50-34 is 146 mm.



^ how does it shift with extralite rc2? And did you have to rotate the rings?


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PostPosted: Thu Aug 16, 2012 2:31 am 
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Joined: Mon May 02, 2011 12:05 pm
Posts: 7
Just received some compact bb30 cranks for the GF's bike.
Interestingly, they are within 40grams of my Vumaquads and would likely be lighter than without the super heavy chainrings.

Sram Red 2012 172.5 50-34
Image

VumaQuad 175 50-34
Image


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PostPosted: Fri Aug 17, 2012 3:30 am 
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Joined: Thu Sep 30, 2010 5:50 am
Posts: 315
So the new Red is lighter then my Hollowgram SL cranks.
For 172.5 50/34 with Praxis rings I am at 543g

I am building a second bike and have been looking for another set of Hollowgrams and am having no luck. At this point I should probably try the new Red, my biggest issue being the increased Q-factor over Hollowgram.


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PostPosted: Fri Aug 17, 2012 2:58 pm 
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Joined: Thu Jul 19, 2012 6:09 pm
Posts: 122
Location: Loveland, CO
timzcat wrote:
So the new Red is lighter then my Hollowgram SL cranks.
For 172.5 50/34 with Praxis rings I am at 543g

I am building a second bike and have been looking for another set of Hollowgrams and am having no luck. At this point I should probably try the new Red, my biggest issue being the increased Q-factor over Hollowgram.


By going with lighter rings on the Red you'll save an additional 50 g. This will put the Red at 472 g. which is very light. I have the GXP version of the new Red and I love it. I got it for less than $400 from a LBS.


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PostPosted: Sun Aug 19, 2012 11:05 am 
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Joined: Sat Aug 22, 2009 11:44 pm
Posts: 113
And finally here is my compact gxp 172.5mm on scale.
92g savings over my 7900 duraace crankset :mrgreen:

Image


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PostPosted: Sun Aug 19, 2012 8:42 pm 
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Joined: Tue Feb 19, 2008 5:17 am
Posts: 584
Location: NZ
Thanks Boralb - scale pic, nice :thumbup:

I wonder how much heavier for a standard 130BCD?

:?

GJ


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Posted: Sun Aug 19, 2012 8:42 pm 


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PostPosted: Sun Aug 19, 2012 9:34 pm 
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Joined: Tue Apr 22, 2008 4:31 am
Posts: 142
Boralb wrote:
And finally here is my compact gxp 172.5mm on scale.
92g savings over my 7900 duraace crankset :mrgreen:



Can you please confirm which rings that is with please ?


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