In the past, Beta was mostly known for its motorcycle trials bikes. However, the Italian manufacturer has shaken that notion by continually improving its off-road motorcycles and dual sport models over the years. Beta’s flagship street-legal dirt bike—the 500 RR-S—sits atop the displacement list in the RR-S lineup. We ran the 478cc four-stroke machine on our in-house dyno to determine peak output from it. We documented 47.0 hp at 8,100 rpm and 32.6 pound-feet of torque at 7,200 rpm.