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Gravely 450 vs Gravely 8171
Verdict: Gravely 450 vs Gravely 8171
The Gravely 450 and the Gravely 8171 are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 17 hp. Gravely 8171 is the lighter machine (424 kg vs 430 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Gravely 8171 is the newer design (1978 vs 1970). 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
17 hp
17 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
GravelyReference
GravelyReference
Two-speed shift-on-the-move affects transmission and PTO speed. Additional two-speed range for transmission can be shifted only when stopped. Right-hand directional clutch lever controls forward and reverse.Reference
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
49.8 ciReference
49.8 ciReference
Bore/Stroke
76 x 83 mmReference
76 x 83 mmReference
Power
12.3 kWReference
—
Air cleaner
dry elementReference
—
Rated RPM
3600Reference
—
Starter volts
12Reference
12Reference
Sparkplug gap
0.635 mmReference
—
Intake valve clearance
0.279 mmReference
—
Exhaust valve clearance
0.279 mmReference
—
Oil capacity
4.7 LReference
1.9 LReference
Power (gross)
—
12.3 kWReference
Starter
—
electricReference
Transmission
Transmission
Swiftamatic 8Reference
—
Type
shaft-driven gearReference
shaft-driven gearReference
Gears
4 forward and reverseReference
8 forward and 4 reverseReference
Oil type
SAE 90W-EPReference
—
Dimensions
Weight
430 kgReference
424 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
106 cmReference
106 cmReference
Height
109 cmReference
109 cmReference
Shipping weight
430 kgReference
424 kgReference
Wheelbase
—
121 cmReference
Ground clearance
—
17 cmReference
Gravely 450 attachments
450 Serial Numbers
Location:
Ahead of rear axle on left side.Reference
—
Electrical
Ground
negativeReference
negativeReference
Battery volts
12Reference
12Reference
Charging system
—
flywheel alternatorReference
Charging amps
—
15Reference
Battery AH
—
42Reference
Attachment overview
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.