Back by popular demand, the general all-things Road forum!
Moderator: robbosmans
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Wizzo
- Posts: 114
- Joined: Mon Aug 16, 2010 9:47 pm
- Location: San Francisco, CA
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by Wizzo on Sun Dec 30, 2012 5:39 am
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.
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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Stuartclark1977
- Posts: 93
- Joined: Tue Sep 13, 2011 9:45 pm
by Stuartclark1977 on Tue Jan 01, 2013 10:31 pm
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
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Firefly FF050
Scott Plasma 5 eTap
Scott Scale RC 900
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OwenN
- Posts: 39
- Joined: Sat Dec 24, 2011 2:28 am
- Location: Roanoke, VA
by OwenN on Wed Jan 02, 2013 3:05 am
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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thisisatest
- Shop Owner
- Posts: 1980
- Joined: Sat Jun 13, 2009 4:02 am
- Location: NoVA/DC
by thisisatest on Wed Jan 02, 2013 4:45 am
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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CBRE
- Posts: 219
- Joined: Mon Dec 08, 2003 1:37 am
- Location: Pittsburgh, PA
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by CBRE on Sat Jan 05, 2013 12:10 am
Removed my Praxis 53t(97g) in favor of a Fiberlyte CF 53(54g) so a final weight of 452g!!
Curt Brown
2016 Cannondale EVO Etap 13.8#'s
2012 Cannondale Supersix EVO etap 13.7#'s
2017 Cannondale SUPER X Force 16.0#'s
2016 Cannondale FatCad2 28.1#'s
2011 Cannondale Carbon Flash 1 17.9#'s
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wpccrunner
- in the industry
- Posts: 429
- Joined: Fri Dec 07, 2012 8:34 pm
- Location: CO
by wpccrunner on Sun Jan 27, 2013 7:28 pm
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
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djconnel
- Posts: 7917
- Joined: Wed Sep 26, 2007 1:57 pm
- Location: San Francisco, CA
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by djconnel on Sun Jan 27, 2013 7:58 pm
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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CBRE
- Posts: 219
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- Location: Pittsburgh, PA
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by CBRE on Mon Jan 28, 2013 12:18 am
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.
Curt Brown
2016 Cannondale EVO Etap 13.8#'s
2012 Cannondale Supersix EVO etap 13.7#'s
2017 Cannondale SUPER X Force 16.0#'s
2016 Cannondale FatCad2 28.1#'s
2011 Cannondale Carbon Flash 1 17.9#'s
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odin99
- Posts: 157
- Joined: Wed Feb 16, 2011 7:46 pm
by odin99 on Mon Jan 28, 2013 5:29 pm
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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LVGH
- Posts: 211
- Joined: Mon Jun 18, 2007 3:12 pm
- Location: NL
by LVGH on Mon Jan 28, 2013 5:47 pm
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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odin99
- Posts: 157
- Joined: Wed Feb 16, 2011 7:46 pm
by odin99 on Mon Jan 28, 2013 6:41 pm
LVGH wrote: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.
excellent thank you. that will save 20g. and you know, 20g is 20g!