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Kubota Z121S vs Kubota ZD221
Verdict: Kubota Z121S vs Kubota ZD221
The Kubota Z121S and the Kubota ZD221 are both lawn tractors — here is how they stack up on the figures that matter. Both are rated at the same 21 hp. Kubota ZD221 is the lighter machine (124 kg vs 339 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Kubota ZD221 holds more fuel (23.1 L vs 16.3 L) for longer stints between fills. Kubota Z121S is the newer design (2014 vs 2008). 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
air-cooled vertical-shaft V-TwinReference
liquid-cooled horizontal-shaft inlineReference
Steering
differential powerReference
differential powerReference
Original price
—
$11,863 ( 54 )Reference
Engine
Fuel tank
16.3 LReference
23.1 LReference
Displacement
45.6 ciReference
47.5 ciReference
Power (gross)
15.7 kWReference
15.7 kWReference
Rated RPM
3600Reference
3200Reference
Starter
electricReference
electricReference
Starter volts
12Reference
12Reference
Oil capacity
2.3 LReference
7.5 LReference
Bore/Stroke
—
67 x 74 mmReference
Coolant capacity
—
1.4 LReference
Transmission
Transmission
Hydro-Gear ZT3100Reference
—
Gears
infinite forward and reverseReference
infinite forward and reverseReference
PTO & Hydraulics
Mid PTO
independentReference
independentReference
Clutch
electric dry discReference
hydraulic wet discReference
Dimensions
Wheelbase
115 cmReference
129 cmReference
Weight
339 kgReference
564 kgReference
Front tire
11x4-5Reference
13x5.0-6Reference
Rear tire
22x10-14Reference
23x10.5-12Reference
Lawn/turf front
11x4-5Reference
13x5.0-6Reference
Lawn/turf rear
22x10-14Reference
23x10.5-12Reference
Length
194 cmReference
213 cmReference
Width
120 cmReference
121 cmReference
Height (ROPS)
165 cmReference
134 cmReference
Front tread
79 cmReference
87 cmReference
Rear tread
95 cmReference
92 cmReference
Kubota Z121S attachments
Electrical
Ground
negativeReference
negativeReference
Charging amps
15Reference
14Reference
Battery CCA
300Reference
475Reference
Battery volts
12Reference
12Reference
Charging volts
—
14Reference
48" Mower deck
Type
hydrostaticReference
hydrostaticReference
Cutting width
121 cmReference
—
Overall width
155 cmReference
—
Cut height
3 to 11 cmReference
—
Kubota ZD221 attachments
Attachment overview
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.