The ornamental design of an outer side portion of a brake rotor, as shown and described.
FIG. 1 is a first perspective view of a first embodiment thereof, as viewed from a generally front-elevational perspective;
FIG. 2 is a second perspective view of the embodiment of FIG. 1 as viewed from a perspective intermediate front-elevation and a side elevation thereof;
FIG. 3 is a third perspective view of the embodiment of FIGS. 1 and 2 as viewed from a generally side-elevational perspective;
FIG. 4 is a first perspective view of a second embodiment thereof as viewed from a generally front-elevational perspective; and,
FIG. 5 is a second perspective view of the embodiment of FIG. 4 as viewed from a generally side-elevational perspective.