Head to head · Row Crop

Allis Chalmers D21 Series I vs Claas Ares 556

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Allis ChalmersModel A

Allis Chalmers D21 Series I

Row Crop

power
103 hp
displacement
426 ci
Cylinders
6
Forward gears
8
Full D21 Series I specs
Image not recorded
ClaasModel B

Claas Ares 556

Tractor

power
104 hp
displacement
276 ci
Cylinders
4
Forward gears
32
Full Ares 556 specs
Allis ChalmersAllis Chalmers D21 Series I
vs
ClaasClaas Ares 556

How they compare

Headline specs vs. the whole Row Crop

n = 1,140–1,417

Engine Power

▲ Ares 556 higher · +1 hp (<1%)
D21 Series I103 hp
Ares 556104 hp
Median Row Crop Tractor138 hp

D21 Series I is in the 27th percentile; Ares 556 is in the 28th · 1,206 models

Engine Displacement

▲ D21 Series I higher · +150 ci (+54%)
D21 Series I426 ci
Ares 556276 ci
Median Row Crop Tractor391 ci

D21 Series I is in the 72nd percentile; Ares 556 is in the 26th · 1,409 models

Cylinders

▲ D21 Series I higher · +2 (+50%)
D21 Series I6
Ares 5564
Median Row Crop Tractor6

D21 Series I is in the 50th percentile; Ares 556 is in the 17th · 1,417 models

Forward Gears

▲ Ares 556 higher · +24 (+300%)
D21 Series I8
Ares 55632
Median Row Crop Tractor16

D21 Series I is in the 16th percentile; Ares 556 is in the 91st · 1,200 models

D21 Series I (A)Ares 556 (B)Median Row Crop Tractor

Full comparison

Every spec, side by side

General Information

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
ManufacturerAllis ChalmersClaas—
ModelD21 Series IAres 556—
CategoryRow CropNot recorded—

Engine

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
ManufacturerAllis ChalmersDPS—
Model34004045 TRT—
Power Output103hp104hp▲ Ares 556+1 hp · <1%
Rated RPM2,200RPM2,000RPM▲ D21 Series I+200 RPM · +10%
Cylinders64▲ D21 Series I+2 · +50%
Displacement426ci276ci▲ D21 Series I+150 ci · +54%
Bore4.3in4.2in▲ D21 Series I+0.1 in · +2%
Stroke5in5inSame

Transmission

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
TypeSliding gear with dry disc clutchNot recorded—

Dimensions & Weight

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
Length161in158in▲ D21 Series I+3 in · +2%
Width91.6inNot recorded—
Height107in112in▲ Ares 556+5 in · +5%
Operating Weight9,500lb11,532lb▲ Ares 556+2,032 lb · +21%

Hydraulics

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
Steering TypePowerhydrostatic power—

Power Take-off (PTO)

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
TypeIndependentNot recorded—
Speed 11,000rpmNot recorded—

Hitch & Towing

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
Hitch TypeThree-Point HitchNot recorded—
Hitch CategoryIII/IINot recorded—
Hitch PositionRearNot recorded—

Chassis & Drive

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
Chassis Type4x2 2WD4x4 MFWD 4WD—
Drive Type2WD4WD—
Steering TypePowerhydrostatic power—
Brake TypeBand actuated discNot recorded—

Electrical

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
Starter TypeElectricNot recorded—

Capacities

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
Coolant5.3galNot recorded—

Operator Station

SpecAllis Chalmers D21 Series IClaas Ares 556Difference
TypeOpenNot recorded—

Category context

Both models against the field

Engine Power

median 138 hp
A · 27th percentile (103 hp)B · 28th percentile (104 hp)

Engine Displacement

median 391 ci
A · 72nd percentile (426 ci)B · 26th percentile (276 ci)

Cylinders

median 6
A · 50th percentile (6)B · 17th percentile (4)

Forward Gears

median 16
A · 16th percentile (8)B · 91st percentile (32)

Operating Weight

median 12,307 lb
A · 28th percentile (9,500 lb)B · 44th percentile (11,532 lb)
A · D21 Series IB · Ares 556Median Row Crop Tractor
Full spec pageAllis Chalmers D21 Series IFull spec pageClaas Ares 556