is it compatible the left crank arm of ultegra 6600 with ultegra 6800? 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
Both the 6600 series and the 6800 series use the same diameter spindle(24mm). The interface is Shimano standard Hollowtech II.