Compare/Deutz-Allis 1817 Sigma vs Deutz-Allis 1920 Ultima

Deutz-Allis 1817 Sigma vs Deutz-Allis 1920 Ultima

Verdict: Deutz-Allis 1817 Sigma vs Deutz-Allis 1920 Ultima

The Deutz-Allis 1817 Sigma and the Deutz-Allis 1920 Ultima are both lawn tractors — here is how they stack up on the figures that matter. Deutz-Allis 1920 Ultima leads on rated power with 20 hp against 17 hp. Deutz-Allis 1817 Sigma is the lighter machine (232 kg vs 395 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Deutz-Allis 1920 Ultima holds more fuel (16.1 L vs 8.3 L) for longer stints between fills. Deutz-Allis 1817 Sigma is the newer design (1989 vs 1987). In short: choose the Deutz-Allis 1920 Ultima for outright pulling power, or the Deutz-Allis 1817 Sigma if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

Tune the fit score

Tell us about your operation

Acreage600 acBudgetMain crop / use

Fit & specs

Deutz-Allis

Fit score

Best match

Clear

Deutz-Allis

Fit score

Best match

Clear

Rated power

17 hp

20 hp

Confidence

40%

Guide price

—

Overview

Distributor

Deutz-AllisReference

Manufacturer

SimplicityReference

air-cooledReference

air-cooled horizontal-shaft opposed-twinReference

Final drives

—

spur gearReference

Engine

Fuel tank

8.3 LReference

16.1 LReference

Displacement

42.18 ciReference

46.98 ciReference

Bore/Stroke

87 x 55 mmReference

79 x 78 mmReference

Power

12.7 kWReference

—

Starter volts

12Reference

Power (gross)

—

14.9 kWReference

Air cleaner

—

dry dual elementReference

Compression

—

6.6:1Reference

Rated RPM

—

3400Reference

Oil capacity

—

5.7 LReference

Sparkplug

—

Champion RV15YCReference

Sparkplug gap

—

0.635 mmReference

Transmission

Eaton 850Reference

Sundstrand 15Reference

Gears

infinite forward and reverseReference

infinite forward and reverse (2-range)Reference

Oil type

—

Type F ATFReference

Dimensions

Wheelbase

122 cmReference

129 cmReference

Weight

232 kgReference

395 kgReference

Front tire

15x6.00-6Reference

16x6.50-8Reference

Rear tire

23x10.5-12Reference

Lawn/turf front

15x6.00-6Reference

16x6.50-8Reference

Lawn/turf rear

23x10.5-12Reference

Length

170 cmReference

198 cmReference

Width

93 cmReference

97 cmReference

Height (steering wheel)

105 cmReference

119 cmReference

Height (hood)

82 cmReference

—

Ag front

—

16-6.50x8Reference

Ag rear

—

23-10.5-12Reference

Deutz-Allis 1817 attachments

Electrical

Ground

negativeReference

Battery volts

12Reference

Charging system

—

flywheel alternatorReference

Charging amps

—

15Reference

Attachment overview

48" Mower deck

Type

hydrostaticReference

shaft-driven hydrostaticReference

Cutting width

121 cmReference

—

Variants

SunStar 20

—

similar Simplicity modelReference

PTO & Hydraulics

Rear Type

—

0Reference

Rear PTO

—

independentReference

Clutch

—

electricReference

Rear PTO Type

—

3400Reference

Front PTO

—

independentReference

Front PTO Type

—

pulleyReference

Deutz-Allis 1920 attachments

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.