The Simplicity Serf 525 is a 1969 lawn tractor from the Serf Series manufactured by Simplicity, a part of Allis Chalmers. It features a 5 hp Briggs & Stratton 206cc 1-cylinder air-cooled gasoline engine with a carburetor fuel system and electric starter. The tractor has a 3-speed belt-driven gear transmission with 3 forward and 1 reverse gears, two-wheel drive, and manual steering. It has an open operator station and rides on 4.80/4.00x8 lawn/turf rear tires. Dimensions are 51.5 inches in length and 26 inches in width. Electrical system is 12 volts with negative ground. Attachments include a 2" mid-mount mower deck with 2 blades and manual lift, and a 42" front-mount blade with manual lift. Related models include the Serf 535 and Serf 515.