The ornamental design for a chainring, as shown and described.
FIG. 1 is a right side perspective view of a chainring showing the new design;
FIG. 2 is a left side perspective view of the chainring;
FIG. 3 is an enlarged right-side elevation view of the chainring portion encompassed by the broken line circle in FIG. 1;
FIG. 4 is an enlarged left-side elevation view of the chainring portion encompassed by the broken line circle in FIG. 2;
FIG. 5 is an enlarged rear view of one of the teeth of the chainring;
FIG. 6 is an enlarged front view of the tooth in FIG. 6; and,
FIG. 7 is a top plan view of a portion of the chainring, wherein the bottom plan view is a mirror image thereof.
My design is a chainring characterized by a plurality of teeth formed about the periphery thereof. Shading and/or dashed lines are not features or part of the design, but are used to illustrate surface contours or environment in the drawings. The broken lines shown in the drawings illustrate environmental structure and portions of the chainring that forms no part of the claimed design.