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Gravely 812 vs Gravely 8121
Verdict: Gravely 812 vs Gravely 8121
The Gravely 812 and the Gravely 8121 are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 12 hp. Gravely 8121 is the lighter machine (403 kg vs 408 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Gravely 8121 is the newer design (1978 vs 1973). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.
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Fit & specs
Gravely
62
Fit score
Best match
Clear
Gravely
62
Fit score
Best match
Clear
Rated power
12 hp
12 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
GravelyReference
GravelyReference
air-cooled horizontal-shaftReference
Four gears (1-4) in two ranges (low/high) with directional control lever (forward/reverse). Reverse speeds are the same in high or low range.Reference
Engine
Fuel tank
20.1 LReference
—
Displacement
29.07 ciReference
29.07 ciReference
Bore/Stroke
83 x 86 mmReference
83 x 86 mmReference
Power
8.9 kWReference
—
Rated RPM
3600Reference
—
Starter
electricReference
electricReference
Starter volts
12Reference
12Reference
Sparkplug gap
0.635 mmReference
—
Intake valve clearance
0.229 mmReference
—
Exhaust valve clearance
0.457 mmReference
—
Oil capacity
5.7 LReference
1.9 LReference
Power (gross)
—
8.9 kWReference
Transmission
Type
shaft-driven gearReference
shaft-driven gearReference
Gears
8 forward and 4 reverseReference
8 forward and 4 reverseReference
Oil type
SAE30Reference
—
Dimensions
Weight
408 kgReference
403 kgReference
Front tire
16x6.50-8Reference
16x7.50-8Reference
Rear tire
23x8.50-12Reference
23x10.50-12Reference
Lawn/turf front
16x6.50-8Reference
16x7.50-8Reference
Lawn/turf rear
23x8.50-12Reference
23x10.50-12Reference
Length
191 cmReference
191 cmReference
Width
92 cmReference
92 cmReference
Height
109 cmReference
109 cmReference
Shipping weight
408 kgReference
403 kgReference
Wheelbase
—
121 cmReference
Ground clearance
—
17 cmReference
Gravely 812 attachments
812 Serial Numbers
Location:
In front of, and below, air cleaner.Reference
—
Electrical
Ground
negativeReference
negativeReference
Battery volts
12Reference
12Reference
Battery AH
43Reference
42Reference
Battery Group
22FReference
—
Charging system
—
flywheel alternatorReference
Charging amps
—
15Reference
Attachment overview
Variants
8120
—
mechanical liftReference
8121
—
hydraulic liftReference
Capacities
Fuel
—
20.1 LReference
PTO & Hydraulics
Hydraulic system
—
1.4 LReference
Capacity
—
1.4 LReference
Pressure
—
82.7 barReference
Pump flow
—
6.4 lpmReference
Mid PTO
—
independentReference
Clutch
—
mechanicalReference
Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.