Compare/Gravely 1138 vs Gravely 8121

Gravely 1138 vs Gravely 8121

Verdict: Gravely 1138 vs Gravely 8121

The Gravely 1138 and the Gravely 8121 are both lawn tractors — here is how they stack up on the figures that matter. Gravely 8121 leads on rated power with 12 hp against 11 hp. Gravely 8121 is the lighter machine (403 kg vs 477 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Gravely 1138 is the newer design (1984 vs 1978). In short: choose the Gravely 8121 for outright pulling power, or the Gravely 1138 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

Gravely

Fit score

Best match

Clear

Gravely

Fit score

Best match

Clear

Rated power

11 hp

12 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

Gravely (a part of Ariens)Reference

GravelyReference

air-cooled vertical-shaftReference

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

6.6 LReference

—

Power (gross)

8.2 kWReference

8.9 kWReference

Starter

electricReference

Starter volts

12Reference

Oil capacity

1.4 LReference

1.9 LReference

Displacement

—

29.07 ciReference

Bore/Stroke

—

83 x 86 mmReference

Transmission

Gears

6 forward and 1 reverseReference

8 forward and 4 reverseReference

PTO & Hydraulics

Mid PTO

independentReference

Clutch

manualReference

mechanicalReference

Hydraulic system

—

1.4 LReference

Capacity

—

1.4 LReference

Pressure

—

82.7 barReference

Pump flow

—

6.4 lpmReference

Dimensions

Wheelbase

116 cmReference

121 cmReference

Weight

216 kgReference

403 kgReference

Front tire

13x5.00-6Reference

16x7.50-8Reference

Rear tire

18x8.50-8Reference

23x10.50-12Reference

Lawn/turf front

13x5.00-6Reference

16x7.50-8Reference

Lawn/turf rear

18x8.50-8Reference

23x10.50-12Reference

Length

154 cmReference

191 cmReference

Height

91 cmReference

109 cmReference

Shipping weight

244 kgReference

403 kgReference

Width

—

92 cmReference

Ground clearance

—

17 cmReference

Gravely 1138 attachments

Electrical

Ground

negativeReference

Charging amps

3Reference

15Reference

Battery volts

12Reference

Charging system

—

flywheel alternatorReference

Battery AH

—

42Reference

Attachment overview

38" Mower deck

Type

belt-driven gearReference

shaft-driven gearReference

Cutting width

96 cmReference

—

Overall width

125 cmReference

—

Cut height

3 to 10 cmReference

—

Variants

8120

—

mechanical liftReference

8121

—

hydraulic liftReference

Capacities

Fuel

—

20.1 LReference

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.