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PostPosted: Sun Dec 30, 2012 1:30 am 
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Joined: Thu Sep 30, 2010 3:32 pm
Posts: 250
Location: S.E. TN
mises wrote:
From reading this thread it appears that, including BB's, the 170mm BB30 compact I just ordered for my wife's bike will be within 1g of my old THM Clavicula BSA 175mm using the same rings. This is truly appalling. :shock: Maybe I miscalculated....

Calculations are probably spot on. The amazing thing is their price. Right after they came on the market they could be had for ~ $350 shipped.


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PostPosted: Sun Dec 30, 2012 5:39 am 
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Joined: Mon Aug 16, 2010 9:47 pm
Posts: 114
Location: San Francisco, CA
mate wrote:
Wizzo wrote:
Yes it is, BB30 172.5 with Praxis 52/36. I had the luxury to open couple of standard BB30 and GXP cranks with the corresponding BCD Praxis rings to confirm. Should've just read Page 8. :roll:

Did you tried them yet?

How is the shifting with these 52/36?



Shifting is much better than the Sram chainrings. The ramps really guide the chain well. Near instantaneous.

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Posted: Sun Dec 30, 2012 5:39 am 


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PostPosted: Tue Jan 01, 2013 11:50 am 
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Joined: Mon May 07, 2007 1:06 pm
Posts: 150
Location: UK
OK, please dont flame me if its been answered before, skimmed the 15 pages but just want to make sure of a few things before I buy them.

Got a Scott Addict 2009 with 7800 Duraace groupset with a english external BB. I need a new chainset so I am going to buy a 2012 Sram red 53x39, same ratios as my old chainset.

With it I want to buy a Hope bottom bracket with adapter to fit the GXP chainset.

Will it all be OK and will the Duraace front mech work with the new chainset?, I assume I dont need any addtional special tools to fit the chainset, I have a Shimano BB tool.

Links to what I am going to buy.....

http://www.merlincycles.com/bike-shop/r ... m-gxp.html
http://www.merlincycles.com/bike-shop/r ... acket.html
http://www.chainreactioncycles.com/Mode ... elID=26899

Thanks and any other BB recomenations?

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PostPosted: Tue Jan 01, 2013 10:31 pm 
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Joined: Tue Sep 13, 2011 9:45 pm
Posts: 65
Image

So new Sram Red 170 BB30 and Praxis 53/39 (I needed to file one of the mount tabs to make it fit the hidden bolt) weighed 512g (DS arm 177, NDS arm 178, lockring 4g, chainring bolts 9g, chainrings 111g and 33g).

Saved me 139g over a DA7950 (50/34) and another 39g as no longer need the wheels manufacturing pf30 adaptor :D

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PostPosted: Wed Jan 02, 2013 12:30 am 
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Joined: Sat Jun 13, 2009 4:02 am
Posts: 1965
Location: NoVA/DC
That looks sweet. minus the hidden fifth arm, the aesthetics remind me of the 7800C carbon cranks.


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PostPosted: Wed Jan 02, 2013 3:05 am 
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Joined: Sat Dec 24, 2011 2:28 am
Posts: 40
Location: Roanoke, VA
Stuartclark - thanks for posting those pictures, especially the spline pattern. Looks like Red and S900 arms are interchangeable. My left side S900 weighs in at 273 grams. Weight savings should be around 90 grams. If I can find a Red crankset for the right price...


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PostPosted: Wed Jan 02, 2013 4:45 am 
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Posts: 1965
Location: NoVA/DC
Owen,
the spline patterns are the same but the offset is different- s900 series cranks use a longer spindle with arms that point almost straight front-to-back when the cranks are horizontal. The Red cranks use a shorter spindle with arms that are more diagonal.


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PostPosted: Sat Jan 05, 2013 12:10 am 
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Joined: Mon Dec 08, 2003 1:37 am
Posts: 245
Location: Sewickley, PA
Removed my Praxis 53t(97g) in favor of a Fiberlyte CF 53(54g) so a final weight of 452g!!

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Curt Brown
2012 Cannondale Supersix EVO SRAM Red 12.5#'s

2011 Cannondale Carbon Flash 1 17.9#'s

http://cbevo.com/2012_cd_supersix_evo_31.html


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PostPosted: Sun Jan 13, 2013 1:33 pm 
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Joined: Fri Apr 20, 2012 9:04 pm
Posts: 228
Does anyone have any experience with Tune chainrings (preferably 50/34). Also, any views on using them with the new Red Exogram chain set?


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PostPosted: Sun Jan 27, 2013 7:28 pm 
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in the industry

Joined: Fri Dec 07, 2012 8:34 pm
Posts: 173
Location: South Florida
i have 6600 shifters and FD, 7800 RD running 6700 chain/cassette. how will the shifting be putting on the new crank. or hows is the shifting in general with shimano shifters/derailleurs?

PS I know this has most likely already been discussed but I do not feel like reading 15+ pages to find my answer.

thanks :up:

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PostPosted: Sun Jan 27, 2013 7:58 pm 
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Location: San Francisco, CA
CBRE wrote:
Removed my Praxis 53t(97g) in favor of a Fiberlyte CF 53(54g) so a final weight of 452g!!


Didn't you notice a loss in shifting quality? That Praxis is a bit beefy, but I love that Fiberlyte weight number.

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PostPosted: Mon Jan 28, 2013 12:18 am 
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Joined: Mon Dec 08, 2003 1:37 am
Posts: 245
Location: Sewickley, PA
djconnel wrote:
CBRE wrote:
Removed my Praxis 53t(97g) in favor of a Fiberlyte CF 53(54g) so a final weight of 452g!!


Didn't you notice a loss in shifting quality? That Praxis is a bit beefy, but I love that Fiberlyte weight number.



None so far.

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Curt Brown
2012 Cannondale Supersix EVO SRAM Red 12.5#'s

2011 Cannondale Carbon Flash 1 17.9#'s

http://cbevo.com/2012_cd_supersix_evo_31.html


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PostPosted: Mon Jan 28, 2013 5:29 pm 
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Joined: Wed Feb 16, 2011 7:46 pm
Posts: 161
what are the best lightweight and no-so-expensive options for sram gxp english bottom brackets?? (best $/g if you will)

my standard sram bb comes in at 111g even without the plastic sleeve. :( seems to negate a lot of the weight reduction of the new sram crankset. I don't really need ceramic, but there's got to be something much lighter than the one i have for a reasonable price. i know i could spend $200 on a ceramic one, but i don't really have the funds for that.


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PostPosted: Mon Jan 28, 2013 5:47 pm 
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Joined: Mon Jun 18, 2007 3:12 pm
Posts: 210
Location: NL
I bought a Token TK877EX from Ebay (around $35 shipped) to go with my Exogram GXP. Make sure you get the version with Sram road washers. It weighs 91g without the central plastic tube. My crankset weighs 570g btw (175mm compact GXP with 50/34 stock rings). Haven't ridden the combination yet.


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Posted: Mon Jan 28, 2013 5:47 pm 


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PostPosted: Mon Jan 28, 2013 6:04 pm 
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Joined: Tue Nov 24, 2009 12:37 pm
Posts: 98
Just ordered my Sram Red 2012 Exogram GXP 50/34 172.5MM Cranks ($350 all in on the bay)

Might upgrade my bottom bracket at the same time, has anyone used the Ceramic BB's on the following link?:

http://www.fixcycles.co.uk/UNITi_Press_ ... 22399.aspx

I think it will fit my Scott CR1, good weight too 68g claimed is 23g lighter than what I have currently (and my existing BB is making some horrific noises at the mo!).

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