FIG. 1 is a front elevational view of a mountain bicycle frame showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a side elevational view thereof from the left of FIG. 2;
FIG. 4 is a side elevational view thereof from the right of FIG. 2;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a top, front, and side perspective view thereof from the left of FIG. 2;
FIG. 7 is a top, rear, and side perspective view thereof from the left of FIG. 2; and,
FIG. 8 is a bottom plan view thereof.