I am interested in getting a left-side power meter for my road bike. It has Shimano 105 components. I'm considering a 4iiii Precision left-side crank, in a 105 or Ultegra version.
I looked, and don't see the size of my current cranks marked anywhere. How do I measure them? Is the distance the total length of the crank, or the center-to-center distance from the bottom bracket to the pedal spindle?