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.
- Troy-Bilt TB310B Self-Propelled Mower — 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 5 differences that matter most, from the published figures.
- TB310B Self-Propelled Mower has RWD drive; RAZOR 21 SELF PROPELLED has General Transmission® MA 300 drive.
- TB310B Self-Propelled Mower carries a 2-year warranty; RAZOR 21 SELF PROPELLED carries a 3-year warranty, a 1 year difference. Warranty length is the maker's published term. Conditions and commercial-use limits differ between makers.
- TB310B Self-Propelled Mower lists at $519; RAZOR 21 SELF PROPELLED lists at $449, a $70 difference. List price is the maker's own figure before tax, freight and dealer setup. Dealers set the final price.
- TB310B Self-Propelled Mower holds 0.3 gal (0.9 L) of fuel; RAZOR 21 SELF PROPELLED holds 0.3 gal (1.1 L) of fuel, a 0.1 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.
- TB310B Self-Propelled Mower cuts from 1.3 in (32 mm) to 3.7 in (95 mm); RAZOR 21 SELF PROPELLED cuts from 1 in (25 mm) to 4 in (102 mm). The cut-height range is the shortest and tallest cut the deck offers. Most lawns are kept well inside it.
what isn’t comparable
Not comparable
- Weight: not published for TB310B Self-Propelled Mower.
- Ground Speed: not published for TB310B Self-Propelled Mower.
- Bagger Capacity: not published for RAZOR 21 SELF PROPELLED.
- Blades: not published for TB310B Self-Propelled Mower.
- Deck Material: not published for RAZOR 21 SELF PROPELLED.
- Discharge: not published for RAZOR 21 SELF PROPELLED.
- Start Type: not published for RAZOR 21 SELF PROPELLED.
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 | TB310B Self-Propelled Mower Troy-Bilt · Push / Walk-Behind |
RAZOR 21 SELF PROPELLED Ariens · Push / Walk-Behind |
|---|---|---|
| List price | $519 | $449 |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 9.9 ci (163 cc) | 9.9 ci (163 cc) |
| Start Type | Recoil | — |
| Engine Model | 725EXi | — |
| Engine Make | Briggs & Stratton® | Briggs & Stratton EXi 725 |
| Deck | ||
| Cutting Width | 21 in (533 mm) | 21 in (533 mm) |
| Min Cut Height | 1.3 in (32 mm) | 1 in (25 mm) |
| Max Cut Height | 3.7 in (95 mm) | 4 in (102 mm) |
| Deck Material | Steel | — |
| Blades | — | 1 |
| Blade Tip Speed | — | 17001 ft/min (5182 m/min) |
| Discharge | Side | — |
| Cut Positions | 6 | 7 |
| Drive | ||
| Ground Speed | — | 3.7 mph |
| Drive System | RWD | General Transmission® MA 300 |
| Dimensions | ||
| Weight | — | 77 lbs (34.9 kg) |
| Fuel Capacity | 0.3 gal (0.9 L) | 0.3 gal (1.1 L) |
| Commercial / Pro | ||
| Commercial Warranty | No | — |
| General | ||
| Warranty | 2 yr | 3 yr |
| Bagger Capacity | 2.3 bu (81 L) | — |
TB310B Self-Propelled Mower: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — troybilt.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.