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    They wanted a wider, asymetric bottom bracket to accommodate the requirements of their evolving frame designs. Which required a new axle and new arm designs to retain a good q-factor.

    I'm not sure if the above is telling you that you need a SiSL2 left hand crank arm to make it work...but it kinda looks like it. Weird.

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    It does seem so... Thats how it reads anyway.

    So unless i can find some cheap twos, i need just Si's which are 109 (thanks @Dick)

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    Cant you use the ones that came with the stock caad12 Si chainset? *That is if you havent sold them yet

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    It does seem so... Thats how it reads anyway.

    I think that's because the SiSL2 NDS arm compensates for the increase in axle length.

    See what the results of are of @Dammit 's test. I think it will work, there will just be 5mm of extra Q factor somewhere, possibly all on the NDS.

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