crank length

how do i go about checking the length of my cranks? i.e. where do i measure from
need to just replace the left sided arm, so want to make sure i'm ordering the right length.
thanks all
need to just replace the left sided arm, so want to make sure i'm ordering the right length.
thanks all
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it's a truvativ power spline. is the powerspline a different fitmnent to the isis BBs?