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PostPosted: Mon Nov 28, 2016 6:07 am 
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I have searched long and hard and have not found the following weight Matrix. Can anyone help me please with the following.

What are the weights for the following configuration (excluding the Bottom Bracket):

SRAM RED GXP:

172.5mm 53/39, 52/36, 50/34
175 mm 53/39, 52/36, 50/34


I have a 175mm 53/39, on a 56" Frame, I am 5'10". Thinking of switching to a 172.5mm 50/34. Would love to know what the weight difference is between the two !!!


Many thanks for all your help !


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Posted: Mon Nov 28, 2016 6:07 am 


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PostPosted: Mon Nov 28, 2016 6:10 pm 
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2013 Sram Red Exogram Crankset GXP 172.5 50-34t Chainrings: 569g
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PostPosted: Mon Nov 28, 2016 6:46 pm 
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Thanks so much. Hopefully others sill chime in for the other setups


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PostPosted: Mon Nov 28, 2016 7:52 pm 
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SRAM Red eTap Groupset, 172,5mm, GXP, 50/34

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PostPosted: Mon Nov 28, 2016 9:38 pm 
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Are the etap cranks different? I thought SRAM red crabks were all the same


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PostPosted: Tue Nov 29, 2016 8:13 am 
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No. I bought the crank with eTap Groupset but it's similar to the Red cranks. Claimed weight 609 g.

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PostPosted: Tue Nov 29, 2016 2:04 pm 
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I wish SRAM would just post the weights for different configurations.


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PostPosted: Thu Dec 01, 2016 4:59 pm 
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bb30 172.5 50/34t

red22 crank set weight is 517g

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PostPosted: Thu Dec 01, 2016 5:06 pm 
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Wow BB30 is that much lighter, almost 50g


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PostPosted: Thu Dec 01, 2016 6:14 pm 
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Location: Los Feliz, Los Angeles, California
Big diameter spindle = less material in the spindle necessary = lighter.

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PostPosted: Thu Dec 01, 2016 11:01 pm 
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prendrefeu wrote:
Big diameter spindle = less material in the spindle necessary = lighter.

Not just less, Sram use Steel in GXP but Aluminum in BB30 's spindle.
They don't think Aluminum in 24mm spindle is stiff enough so they only use it on 30mm version. (Shimano dura-ace 's spindle is also steel)


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PostPosted: Thu Dec 01, 2016 11:47 pm 
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That is correct.

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Posted: Thu Dec 01, 2016 11:47 pm 


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PostPosted: Sun Dec 04, 2016 10:28 am 
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Steel is still heavier than aluminum in terms of mass. However, since the amount of material would weigh about the same to achieve an equal stiffness, due to the modulus of steel and aluminum. Cost probably has more to do with it, and compatibility with the other groupsets. The same axle, perhaps made with slightly different grade of the same material, can be used on many cranksets throughout the range of groupset levels and the production process would remain about the same. Sram has been using steel axles since the inception of GXP. It's perfectly possible to make aluminum axles for GXP cranksets, but this would cost a significant alteration in the product line, something not economically worthwhile on the scale of business Sram is operating. Mostly likely Sram persists to milk the patent of the GXP crankset technology.

My business strategy would be to develop a whole new line of cranksets with the BB386EVO in mind (Ø30mm axle with 86mm outside-to-outside bearing spacing) and create an all-out better crankset that is slightly lighter and stiffer and with a direct compatibility with more the frames on the market, and forego that pesky BB90 standard that e.g. Trek uses that IMO needs to get dropped anyway. I would also develop a new and integrated (hollow?) chainring standard similar to Shimano.

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