A power roller conveyor system includes a section having a slide mechanism that engages a loop that is driven by an external motor. The loop slides along a surface of the slide mechanism. The slide mechanism maintains the loop in frictional engagement with surfaces of rollers of the conveyor, whereby the rollers are directly driven by the loop. A wheel may bridge a directly driven roller and another roller that is not driven. The other roller and driven roller bridged by the wheel may be separated by an intermediate roller. The section may be a straight section, a 90 degree curved section, or a 180 degree curved section.