Rotor 3D Cranks with Dura Ace 7900 Chainrings

Discuss light weight issues concerning road bikes & parts.
goodboyr
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by goodboyr

I'm thinking of getting a Quarq with this combo in compact for maximum compatibility with my Di2. Just worried about what it will look like. Does anyone have a picture of this setup?

by Weenie


mrfish
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by mrfish

Just use 7800 rings. This will be fine.

7900 rings are extremely pricey and will leave triangular lumps sticking out, which do not match the crank. Not only might they impact your ankle some day, but they will also look very odd. Just get your LBS to unscrew the rings off a 7900 set to see what I mean.

IMHO if you are considering a Rotor crank, you may as well just get a 7900 crank and be done with it. IMO it's a work of art, particularly the big chainring.

goodboyr
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Location: Canada

by goodboyr

Thanks for the info. I already have a full Di2 setup on my bike which includes the 7900 crank. Shifting is amazing. The issue is the quarq powermeter. It doesn't come in a shimano crank. The rotor 3D version of the quarq is compatible with my bottom bracket. So, what I want to do is shift the rings from my 7900 crank to the quarq rotor. No pictures out there?

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Mario Jr.
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by Mario Jr.

Why not try the Rotor Q-rings out? They work very well with Di2.

MoreRideTime
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Location: Canada

by MoreRideTime

SRM does make a "7900" model - they use the 7900 rings and the 7800 arms.

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stephen@fibre-lyte
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by stephen@fibre-lyte

mrfish wrote:you may as well just get a 7900 crank and be done with it. IMO it's a work of art, particularly the big chainring.


That's the thing about art, some people love it and some people hate it. I'm the latter :wink:

goodboyr
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by goodboyr

Sorry, but I think you've drifted a little off my topic. I am interested in the Quarq, not the SRM. I already have a 7900 crank, so, I want to get the Quarq with the Rotor 3d cranks. I'm not really that interested in the Q rings, because I want to retain the perfect shifting Di2 gives me with the 7900 rings. I know many people have reported great shifting with Di2 and the Q rings, so in the end, I may end up there, but it sure would be nice to retain the 7900 rings. So once again, has anybody put 7900 rings on a third party crank? Does it work? Does it look like "franken-crank"??

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lancejohnson
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by lancejohnson

Yes it works, yes it looks frankencrank... Only thing you could do is have someone machine a custom spider for you, but expect to drop about a grand on that between the design and one-off machining...
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goodboyr
Posts: 1388
Joined: Wed Jan 10, 2007 10:56 pm
Location: Canada

by goodboyr

Ok. Done. Ordered it. Just for reference, here is the picture they sent me. I think it looks pretty cool.
Rotor_7900_130.jpg

goodboyr
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by goodboyr

Oh, yeah, I went standard, not compact. They can't do compact with 7950 rings.

tri
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by tri

Why not go with rings from Specialites TA (if it works)? Myself don't like the look of that Dura-rotor combo.

KWalker
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Location: Bay Area

by KWalker

That's absolutely hideous and I find it hard to believe that you can't obtain 99% of the shift quality by using rings from a reputable aftermarket company.
Don't take me too seriously. The only person that doesn't hate Froome.
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devinci
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by devinci

thats what i'd call missmatching stuff

Doolop
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by Doolop

I actually Like the way those rings look on those cranks.

naisan
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Joined: Thu Oct 22, 2009 9:28 pm

by naisan

I've got rotor 3d quarq cranks with SRAM red rings - they look just fine as well.

After you get them spun up to 95RPM nobody will see any of that anyways.

There have been a few people that have started to say something about how it looks, but since most of them don't train with power, they can't keep up long enough to get out a sentence.

Rock on with your chocolate and peanut butter! :twisted:

by Weenie


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