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Power crank compatibility?

I am interested in getting myself a power meter. More than likely left crank only stages or 4iiii (reviews appreciated!)

I have the 105 R5800 groupset/cranks and the meters seem to only come as 105 r7000. If i bought the r7000 power crank, would this fit seamlessly to my current set up or would I have compatibility issues?

Any advice greatly appreciated.


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