The Troy-Bilt 1668R is a 1989 garden tractor built by Troy-Bilt in Port Washington, Wisconsin, USA. It features a 16 hp Briggs & Stratton 655cc 2-cylinder air-cooled gasoline engine, coupled with an Eaton 11 shaft-driven hydrostatic transmission offering infinite forward and reverse gears. The tractor has two-wheel drive and an open operator station. Tires are sized 16x6.50-8 in front and 23x10.50-12 in rear. Electrical system is 12 volts with negative ground.