New Red crank info, must read! :)

Discuss light weight issues concerning road bikes & parts.
nigel379
Posts: 108
Joined: Sat Jun 20, 2009 3:23 am

by nigel379

How much space is there between the crank and the ring? Not a huge worry, but if you throw the chain over will it wedge between the crank and ring (since the peg will be in the wrong spot due to the hidden chainring bolt)? Otherwise, seems to be the new budget ww BB30 crank.

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53x12
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by 53x12

I am curious about stiffness as well. Sounds like SRAM has made some needed improvements with the cranks. But for the cost, you can get a Hollowgram SI crank that will be the same weight all in. Not sure the Red is going to be as stiff as the Hollowgram.
"Marginal gains are the only gains when all that's left to gain is in the margins."

by Weenie


CBRE
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by CBRE

prendrefeu wrote:...on a scale.

Just because, you know, as someone who has been a member since 2003 would be familiar with, scale shots are required for verity on this forum.



Not going to pull the crank back off but here is the ring and my crank:
ImageImage
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

CBRE
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by CBRE

53x12 wrote:I am curious about stiffness as well. Sounds like SRAM has made some needed improvements with the cranks. But for the cost, you can get a Hollowgram SI crank that will be the same weight all in. Not sure the Red is going to be as stiff as the Hollowgram.



The new Red crank is very stiff, much better than the 2011 Red unit, plenty stiff for me at 145#'s. Now the TA ring is fine for me but I would think a 200# sprinter type should get a set of Praxis rings, light and strong.
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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prendrefeu
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by prendrefeu

Thanks for the photos.

The weight on that chainring. YIKES. :shock:
Exp001 || Other projects in the works.

durkonion
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Joined: Sat Dec 22, 2007 4:17 am

by durkonion

Sounds like an easy way to shed a bit of weight! I guess we just have to find some rings that are the correct thickness at the hidden bolt location so we don't get runout issues. It probably won't be long before TA/Fiberlyte/etc make rings with movable catchpins so it'll work on this crank.

Alreadyhadone
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Joined: Sun Apr 29, 2012 9:42 am

by Alreadyhadone

Though the Sram chainring is pretty heavy compared to others it does have some aero advantage.

quaman26
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Joined: Mon Apr 19, 2010 9:44 pm

by quaman26

53x12 wrote:I am curious about stiffness as well. Sounds like SRAM has made some needed improvements with the cranks. But for the cost, you can get a Hollowgram SI crank that will be the same weight all in. Not sure the Red is going to be as stiff as the Hollowgram.


I have been trying to look for Hollowgram SI's or SL's but have not had luck finding them sub $500. And with SRAM being <400, that would be a good buy.

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ave
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by ave

So, what do you think, why do SRAM put so much material into it?
wasting 64grams of aluminium?

Broid
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Joined: Wed Dec 21, 2011 7:39 pm

by Broid

Interesting. My Evo has Sram Red compact rings and when I replaced them with Praxis Works rings I weighed the Red rings together and came up with 138g.
Attachments
compact chain rings post.jpg

CBRE
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by CBRE

Broid wrote:Interesting. My Evo has Sram Red compact rings and when I replaced them with Praxis Works rings I weighed the Red rings together and came up with 138g.



That's OLD Red, I Have the new 2012 Red.
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

CBRE
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by CBRE

ave wrote:So, what do you think, why do SRAM put so much material into it?
wasting 64grams of aluminium?



I would not say wasting, the new ring shifts great and is the stiffest I've seen, but at 145#'s on an 11# bike I don't need them that stiff, thus the lighter ring(WW you know:)).
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

sfcyclist1
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Joined: Wed Jan 14, 2009 7:16 pm
Location: Brisbane CA

by sfcyclist1

I am sure this isn't true, "Compatible only with SRAM Yaw Front Derailleur"

Thanks for sharing!

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CharlesM
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Location: Phoenix Arizona

by CharlesM

The Yaw of the front der doesnt have as much to do with shifting as it does in dealing with chain line. The lift and more firm action is where the shifting benefit comes in


It's also off base to say the new cranks are "a lot" stiffer than the old ones. Theyre not. The old ones were pretty dang good. The thing that most folks are feeling is a much better ring design and a much improved front Der action. That said, I wouldnt hesitate to go to the new praxis rings and cut weight without giving much away (if anything at all) in shifting.

CBRE
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by CBRE

Your right on the crank stiffness thing, I don't think I could flex any crank at 145#'s! Im ordering the Praxis rings also.
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

by Weenie


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