Method for assembling a roller conveyor having a plurality of successive, driven rollers mounted at a predefined pitch (p) on a frame of the roller conveyor, the successive rollers supporting and conveying products in use of the roller conveyor, the method comprising the steps of: - providing the plurality of successive rollers each having a cylindrical roller body and a first and a second support element (7, 8) on respective opposite ends of the roller body, the second support element having pulley means, - providing a frame having a first and a second, mutually parallel, elongate frame part (18, 19) for mounting therebetween the plurality of successive rollers, wherein the first and second frame part each have a plurality of mounting provisions (24, 26) spaced apart at the pitch (p), the method being characterized in that it comprises for the purpose of mounting a roller of the plurality of rollers to the frame, the further steps of: - mounting the first support element of a roller to a first mounting provision of the first frame part while leaving the opposite second support element of that roller free from a second mounting provision of the second frame part, - passing an endless flexible drive element and a further endless flexible drive element over the pulley means of the roller, wherein the drive element also passes over the pulley means of a previously mounted neighbouring roller and wherein the further drive element is still to be passed about another neighbouring roller still to be mounted, - tensioning the drive element by exerting a force on the roller by means of a tensioning device, - mounting the second support element of the roller to the second mounting provision while keeping the drive element tensioned by the tensioning device, and then - removing the tensioning device from the roller. the method comprising the steps of: - providing the plurality of successive rollers each having a cylindrical roller body and a first and a second support element (7, 8) on respective opposite ends of the roller body, the second support element having pulley means, - providing a frame having a first and a second, mutually parallel, elongate frame part (18, 19) for mounting therebetween the plurality of successive rollers, wherein the first and second frame part each have a plurality of mounting provisions (24, 26) spaced apart at the pitch (p), - providing the plurality of successive rollers each having a cylindrical roller body and a first and a second support element (7, 8) on respective opposite ends of the roller body, the second support element having pulley means, - providing a frame having a first and a second, mutually parallel, elongate frame part (18, 19) for mounting therebetween the plurality of successive rollers, wherein the first and second frame part each have a plurality of mounting provisions (24, 26) spaced apart at the pitch (p), the method being characterized in that it comprises for the purpose of mounting a roller of the plurality of rollers to the frame, the further steps of: - mounting the first support element of a roller to a first mounting provision of the first frame part while leaving the opposite second support element of that roller free from a second mounting provision of the second frame part, - passing an endless flexible drive element and a further endless flexible drive element over the pulley means of the roller, wherein the drive element also passes over the pulley means of a previously mounted neighbouring roller and wherein the further drive element is still to be passed about another neighbouring roller still to be mounted, - tensioning the drive element by exerting a force on the roller by means of a tensioning device, - mounting the second support element of the roller to the second mounting provision while keeping the drive element tensioned by the tensioning device, and then - removing the tensioning device from the roller. - mounting the first support element of a roller to a first mounting provision of the first frame part while leaving the opposite second support element of that roller free from a second mounting provision of the second frame part, - passing an endless flexible drive element and a further endless flexible drive element over the pulley means of the roller, wherein the drive element also passes over the pulley means of a previously mounted neighbouring roller and wherein the further drive element is still to be passed about another neighbouring roller still to be mounted, - tensioning the drive element by exerting a force on the roller by means of a tensioning device, - mounting the second support element of the roller to the second mounting provision while keeping the drive element tensioned by the tensioning device, and then - removing the tensioning device from the roller.