0% Financing | Learn More Efficient operation, smooth cuts, durable components, and a comfortable ride…all in one ultimate zero-turn mower. Meet the STIHL RZ 900 Series. With a generous 60” or 72” mowing deck and three distinct engine options, pros can choose the mower that’s right for even the most demanding landscaping jobs. Featuring an advanced four-wheel suspension system with mowing deck height compensation, an independent front suspension, rear suspension with shock absorbers, and a premium suspension seat, the STIHL RZ 900 Series of zero-turn mowers is all about keeping pros comfortable day in and day out. The powerful Hydro-Gear® ZT-5400 transaxles provide an efficient top forward ground speed of 12 mph and a top reverse speed of 5 mph. The heavy-duty greaseable 10” cast iron deck spindles are the strongest on the market, offering long life and serviceability. The STIHL RZ 900 Series gets the job done.