Originally Posted by JohnDThompson

The teeth on Stronglight rings are centered with respect to the thickness of the ring, while those on Sakae Ringyo rings are offset slightly, with a ramp on what is intended to be the inner face of the ring. If you use what is designed to be a middle ring on a Sakae Ringyo crank as the outer ring instead, that ramp will be on the outside (unless you ignore the counterbore for the bolts and let the bolts stand pround of the ring face), and shifting will suffer.

Been there, done that.