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Key differences: S160Lawn Tractor has more weight, a wider cutting deck, a smaller engine and more engine power. S120Lawn Tractor has less weight, a narrower cutting deck, a larger engine and less engine power. Objective comparison of stated specs — not a recommendation.
How to read the labels
  • larger / more / wider / faster — this mower has the higher value for that spec.
  • smaller / less / lighter / slower — this mower has the lower value.
  • Labels are directional only; whether more is desirable depends on your needs.
  • Note: a lower deck-gauge number means thicker steel, so for Deck Gauge a smaller number is the more durable deck.
Spec S160Lawn Tractor
John Deere · Riding (Lawn Tractor)
S120Lawn Tractor
John Deere · Riding (Lawn Tractor)
Engine
Power Source gas gas
Displacement 44.2 ci (724 cc) smaller 44.2 ci (724.3 cc) larger
Engine Power 24 hp more power 22 hp less power
Cylinders 2 2
Engine Model 44U877 (M44) 44N677 (M44)
Fuel Type Gasoline Gasoline
Deck
Cutting Width 48 in (1219 mm) wider 42 in (1067 mm) narrower
Min Cut Height 1 in (25 mm) 1 in (25 mm)
Max Cut Height 4 in (102 mm) 4 in (102 mm)
Deck Material Steel, 12 gauge0.105 in.2.7 mm Steel, 13 gauge0.090 in.2.3 mm
Discharge Side discharge Side discharge
Deck Gauge 12 13
Drive
Transmission Hydrostatic, 2-wheel drive Hydrostatic, 2-wheel drive
Ground Speed 5.5 mph 5.5 mph
Drive System Electric power take-off (PTO) clutch Manual power take-off (PTO)
Reverse Speed 3.2 mph 3.2 mph
Dimensions
Weight 481 lbs (218.2 kg) heavier 444 lbs (201.4 kg) lighter
Fuel Capacity 2.4 gal (9.1 L) 2.4 gal (9.1 L)
Length 74.9 in.1903 mm 69.7 in.1770 mm
Height 45.3 in.1151 mm 44 in.1118 mm
General
Warranty 2 yr 2 yr
Bagger Capacity 6.5 bu (229 L) 6.5 bu (229 L)

Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.