Husqvarna RZ4621 46-Inch 21 HP Briggs & Stratton Gas Powered Zero Turn Riding Lawn Mower 46-inch stamped cutting deck 21 hp briggs and stratton endurance engine 2 blade - electric clutch engagement Dual Hydro-Gear EZT Drive System Front tires: 11 by 4 - 5 rear tires: 18 by 8-1/2 - 8 turf