A set of conveyor rollers for use in agricultural machines, especially those of the stalk and tall plants harvester type, including front elements arranged in an independent front platform. The conveyor roller set includes a front aperture (6) for receiving the harvested material (MC) from a platform (P), the set including at least one upper roller (20a) and at least one lower roller (20b) disposed in the platform (A), wherein the upper conveyor roller (20a′) has a diameter (D) greater than the diameter (d) of the lower conveyor roller (20b). The present invention further relates to a harvesting machine, which is provided with a set of conveyor rollers according to the present invention.
