Originally Posted by
datlas
The splines on the BB spindle don't really permit you to get "close" to 180 degrees, and I have never had a problem with this. You could rotate it one spline/notch in each direction to confirm it's right.
You cannot install the non-drive side (left) crank arm incorrectly. The splines are keyed, meaning they are not equally sized and spaced, to ensure that the left arm can only be installed onto the spindle at 180° from the drive-side crank arm.