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I would like to buy a power meter and the nearest I found to my shimano ultegra 6600 crankset is the ultegra 6800 left crank arm. It is the same size though. many thanks

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  • Other than an optical difference there is no functional difference. Just be sure to acquire the correct length.
    – Carel
    Jun 11, 2018 at 15:28

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Both the 6600 series and the 6800 series use the same diameter spindle(24mm). The interface is Shimano standard Hollowtech II.

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