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Kubota GR2120 vs Kubota Z121S
Verdict: Kubota GR2120 vs Kubota Z121S
The Kubota GR2120 and the Kubota Z121S are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 21 hp. Kubota Z121S is the lighter machine (339 kg vs 439 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Kubota GR2120 holds more fuel (18.2 L vs 16.3 L) for longer stints between fills. Kubota Z121S is the newer design (2014 vs 2010). 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
Kubota
71
Fit score
Best match
Clear
Kubota
71
Fit score
Best match
Clear
Rated power
21 hp
21 hp
Confidence
98%
98%
Guide price
—
—
Overview
Manufacturer
KubotaReference
KubotaReference
Hydrostatic transmission with single foot pedal and standard cruise control.Reference
air-cooled vertical-shaft V-TwinReference
Steering
hydrostatic power (Glide Steer)Reference
differential powerReference
Engine
Fuel tank
18.2 LReference
16.3 LReference
Displacement
47.5 ciReference
45.6 ciReference
Bore/Stroke
67 x 74 mmReference
—
Power (gross)
15.7 kWReference
15.7 kWReference
Starter
electricReference
electricReference
Starter volts
12Reference
12Reference
Rated RPM
—
3600Reference
Oil capacity
—
2.3 LReference
Transmission
Type
shaft-driven hydrostaticReference
hydrostaticReference
Gears
infinite forward and reverseReference
infinite forward and reverseReference
Transmission
—
Hydro-Gear ZT3100Reference
Dimensions
Wheelbase
128 cmReference
115 cmReference
Weight
439 kgReference
339 kgReference
Front tire
16x7.5-8Reference
11x4-5Reference
Rear tire
23x10.50-12Reference
22x10-14Reference
Lawn/turf front
16x7.5-8Reference
11x4-5Reference
Lawn/turf rear
23x10.50-12Reference
22x10-14Reference
Length
196 cmReference
194 cmReference
Height
129 cmReference
—
Front tread
82 cmReference
79 cmReference
Rear tread
80 cmReference
95 cmReference
Width
—
120 cmReference
Height (ROPS)
—
165 cmReference
Kubota GR2120 attachments
GR2120 Serial Number Location
Electrical
Ground
negativeReference
negativeReference
Battery volts
12Reference
12Reference
Charging amps
—
15Reference
Battery CCA
—
300Reference
Attachment overview
PTO & Hydraulics
Mid PTO
—
independentReference
Clutch
—
electric dry discReference
Kubota Z121S attachments
48" Mower deck
Cutting width
—
121 cmReference
Overall width
—
155 cmReference
Cut height
—
3 to 11 cmReference
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.