The Simplicity ZT18 is a zero-turn mower produced from 1999 to 2003 by Simplicity in Port Washington, Wisconsin, USA. It features an 18 hp Vanguard 569cc 2-cylinder air-cooled V-Twin gasoline engine, hydrostatic Eaton 778 transmission with infinite forward and reverse speeds, and two-wheel drive with hydrostatic differential steering. The mower has a 50-inch mid-mount mower deck with 3 blades, and an open operator station. It weighs 670 lbs with the mower deck and rides on 13x5.0-6 front and 18x9.5-8 rear lawn/turf tires. The original price was $5,175 in 1998.