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  1. #1
    Daniel the Dog
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    XTR 970 or XT 770 crank arms: Which one?

    I would be using the rings off the XT crank with a Black Spire small. The XT crankset is new and the XTR is used. I would think the XTR would be stiffer.

    Your thoughts?

  2. #2
    Epic rider
    Reputation: rapsac's Avatar
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    Probably just about equal stiffness but the XTR is lighter.
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  3. #3
    IllumaDucati
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    In my opinion, unless you're going to run without a front derailleur, you'd be better off selling the XT cranks and buying a set of three XTR M970 chainrings for the XTR M970 cranks, which would give you the excellent shifting they're known for.

  4. #4
    Daniel the Dog
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    I was wondering if the XTR crank arms were much lighter then the XT crank arms. I don't like the need for special tools with the 970 XTR. I tried Blackspire rings on the XTR and they didn't shift very well for me....

  5. #5
    ups and downs
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    The XTR crank arms are lighter, but not an astounding amount lighter. The XTR 970 series chainrings are what make those cranks worthwhile (and expensive). So if you weren't planning on using the XTR rings then you might as well go with the XT crank arms.
    I'm a member of NSMBA and IMBA Canada

  6. #6
    mtbr member
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    Quote Originally Posted by rockyuphill View Post
    The XTR crank arms are lighter, but not an astounding amount lighter. The XTR 970 series chainrings are what make those cranks worthwhile (and expensive). So if you weren't planning on using the XTR rings then you might as well go with the XT crank arms.
    +1 I've always read that the weight savings and benefits were in the chain rings but I'm sure the crank arms are a little lighter. If the price difference isn't much, I'd probably go with the XTR crank arms just for the bling factor. I'm sure you'll notice very little difference either one you choose.

  7. #7
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    My M970 cranks are at 535gr and M770 at 592gr. My SLX arms are 592gr also! I see the same level of detail in the 32t chairing for all 3 models only the weights are different (42g, 55g and 62g). The XTR big ring is much thicker so it's stiffer and shifts better but has the same weight as the other 2.

    So for me it would be a choice between XTR (weight) vs SLX (value). I see no valid point to choose XT cranks over SLX.

    For comparison my Raceface Deus arms are at 543gr.

  8. #8
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    I bought XTR cranks on eBay without chainrings and then bought extralite chainrings. Cheaper and lighter. YMMV

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