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.
- Ariens RAZOR 21 PUSH — residential: typical home lawns; 21-inch deck; gas powered
- Ariens RAZOR 21 SELF PROPELLED — residential: typical home lawns; 21-inch deck; gas powered
What’s different? The 4 differences that matter most, from the published figures.
- RAZOR 21 PUSH uses a Briggs & Stratton EX 625 engine; RAZOR 21 SELF PROPELLED uses a Briggs & Stratton EXi 725 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.
- RAZOR 21 PUSH lists at $399; RAZOR 21 SELF PROPELLED lists at $449, a $50 difference. List price is the maker's own figure before tax, freight and dealer setup. Dealers set the final price.
- RAZOR 21 PUSH weighs 69 lbs (31.3 kg); RAZOR 21 SELF PROPELLED weighs 77 lbs (34.9 kg), a 8 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What RAZOR 21 PUSH's weight means for a trailer ›
- RAZOR 21 PUSH has a 9.2 ci (150 cc) engine; RAZOR 21 SELF PROPELLED has a 9.9 ci (163 cc) engine, a 0.8 ci difference. Displacement is the engine's size, not its output. A larger engine is not necessarily a more powerful one.
what isn’t comparable
Not comparable
- Ground Speed: not published for RAZOR 21 PUSH.
- Drive System: not published for RAZOR 21 PUSH.
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 | RAZOR 21 PUSH Ariens · Push / Walk-Behind |
RAZOR 21 SELF PROPELLED Ariens · Push / Walk-Behind |
|---|---|---|
| List price | $399 | $449 |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 9.2 ci (150 cc) | 9.9 ci (163 cc) |
| Engine Make | Briggs & Stratton EX 625 | Briggs & Stratton EXi 725 |
| Deck | ||
| Cutting Width | 21 in (533 mm) | 21 in (533 mm) |
| Min Cut Height | 1 in (25 mm) | 1 in (25 mm) |
| Max Cut Height | 4 in (102 mm) | 4 in (102 mm) |
| Blades | 1 | 1 |
| Cut Positions | 7 | 7 |
| Blade Tip Speed | 17001 ft/min (5182 m/min) | 17001 ft/min (5182 m/min) |
| Drive | ||
| Ground Speed | — | 3.7 mph |
| Drive System | — | General Transmission® MA 300 |
| Dimensions | ||
| Weight | 69 lbs (31.3 kg) | 77 lbs (34.9 kg) |
| Fuel Capacity | 0.3 gal (1.1 L) | 0.3 gal (1.1 L) |
| General | ||
| Warranty | 3 yr | 3 yr |
RAZOR 21 PUSH: Specs verified against the retailer listing on Jun 6, 2026 — tkpowerequipment.com.
RAZOR 21 SELF PROPELLED: Specs verified against the retailer listing on Jun 7, 2026 — farmandhomesupply.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.