Bomag has redesigned its 66- and 78-in. tandem-drum rollers (Circle 913) to offer improved operator ergonomics and controls, better performance and greater economy. The new BW266AD-4 has a maximum centrifugal force of 32,800 lb per drum while the BW278AD-4 has a maximum centrifugal force of 37,100 lb per drum. Both feature a redesigned cockpit with an innovative sliding/swivel seat for improved operator comfort and sightlines, reduced fatigue and increased efficiency. The swivel seat makes it easy for the operator to adjust positions without switching seats, while providing a clear view of the drum edges.