The Simplicity Axion 21/42 is a zero-turn mower produced from 2010 to 2011 as part of the Axion Series. It features a 21 hp Briggs & Stratton 1-cylinder engine with a 3 gallon (11.4 L) fuel tank and electric start. The hydrostatic transmission is a Hydro-Gear EZT with infinite forward and reverse speeds. The mower has a mid PTO with an independent electric clutch. Dimensions include a 45 inch (114 cm) wheelbase, 61 inch (154 cm) length, 45 inch (114 cm) height, and a weight of 500 lbs (226 kg). Tires are sized 11x4-4 front and 18x8.50 rear. The operator station is open. Electrical system has a negative ground with a 230 CCA 12 volt battery. Attachments include a 42 inch (106 cm) mid-mount mower deck with 2 blades and electric lift, offering infinite cut positions from 1.5 to 3.75 inches (3 to 9 cm).