Compare Mowers
List prices are the manufacturer’s published figures, re-checked daily; they exclude tax, freight and dealer setup.
A side-by-side reference of each model's stated specifications. MowerFacts doesn’t give opinions: where a published, spec-derived rule can separate machines we mark a Data Pick and show the rule; here, read the values and decide what fits your needs.
Best suited for
What each model is built for, from its duty class and key specs. This is a neutral reference — MowerFacts does not rank one model above another.
- Kubota GR2020G — commercial: daily paid use and high acreage; 48-inch deck; gas powered
- Kubota GR2120 — commercial: daily paid use and high acreage; 48-inch deck
What’s different? The 5 differences that matter most, from the published figures.
- GR2020G uses a Kohler CH640 engine; GR2120 uses a Kubota D782 engine. The engine maker builds the engine; the mower maker chooses the model, rating and fit, so the badge alone does not settle output or longevity.
- GR2020G runs on Gasoline; GR2120 runs on Diesel. Fuel type sets what you buy and store; it is not a measure of power.
- GR2020G has a 38.1 ci (624 cc) engine; GR2120 has a 47.5 ci (778 cc) engine, a 9.4 ci difference. Displacement is the engine's size, not its output. A larger engine is not necessarily a more powerful one.
- GR2020G weighs 882 lbs (400.1 kg); GR2120 weighs 968 lbs (439 kg), a 86 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What GR2020G's weight means for a trailer ›
- GR2020G holds 4.2 gal (15.9 L) of fuel; GR2120 holds 4.8 gal (18 L) of fuel, a 0.6 gal difference. Tank size bounds how long a machine runs between stops. Consumption varies with engine, load and speed, so hours per tank are not fixed.
1 more difference, what isn’t comparable
Other verified differences
- GR2020G has a 20.5 hp engine; GR2120 has a 21 hp engine, a 0.5 hp difference.
Not comparable
- Deck Material: not published for GR2120.
Verified means each manufacturer publishes the figure. A bigger number is only a bigger number; nothing here says which machine is better. The full specification table is below.
Which is faster on your property? › Measure your lawn once and MowerFacts times all 2 against it.
| Spec | GR2020G Kubota · Riding (Lawn Tractor) |
GR2120 Kubota · Riding (Lawn Tractor) |
|---|---|---|
| List price | dealer quote | dealer quote |
| Engine | ||
| Power Source | gas | diesel |
| Displacement | 38.1 ci (624 cc) | 47.5 ci (778 cc) |
| Engine Power | 20.5 hp | 21 hp |
| Engine Make | Kohler CH640 | Kubota D782 |
| Fuel Type | Gasoline | Diesel |
| Deck | ||
| Cutting Width | 48 in (1219 mm) | 48 in (1219 mm) |
| Deck Material | 10 Gauge Steel | — |
| Deck Gauge | 10 | — |
| Drive | ||
| Transmission | Kubota HST | Kubota HST |
| Ground Speed | 6.2 mph | 6.2 mph |
| Drive System | Belt | Belt |
| Dimensions | ||
| Weight | 882 lbs (400.1 kg) | 968 lbs (439 kg) |
| Fuel Capacity | 4.2 gal (15.9 L) | 4.8 gal (18 L) |
Where these models differ, explained
GR2020G: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — kubotausa.com.
GR2120: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — kubotausa.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.