Seat support for motorcycles

FIG. 1 is a left side elevational view of a seat support for motorcycles showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front left perspective view thereof; and,

FIG. 5 is a rear right perspective view thereof.

The broken lines illustrating portions of the motorcycle form no part of the claimed design.