A rod guide is provided for use on a rod string extending through a bore of awellbore tubular. The rod guide has an elongate, generally cylindrical bodyconfigured to be connected in-line with a rod string, and a plurality ofwheelsrotatably fastened to the outside of the cylindrical body and configured torollalong the wellbore tubular. The plurality of wheels are angularly offset fromeachother to provide multiple rolling planes upon which the rod guide my roll, andcanbe arranged in series or in opposing pairs. The wheels also assist incentralizingthe rod guide in the wellbore tubular. When arranged in a helical pattern, thewheels also facilitate rotation of the rod string.
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