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.
- Ferris IS600 Zero Turn Mower — commercial: daily paid use and high acreage; 48-inch deck; gas powered
- Spartan Spartan RZ-XD — commercial: daily paid use and high acreage; 48-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- IS600 Zero Turn Mower holds 6 gal (22.7 L) of fuel; Spartan RZ-XD holds 9.5 gal (36 L) of fuel, a 3.5 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.
- IS600 Zero Turn Mower has a 18.5 hp engine; Spartan RZ-XD has a 24 hp engine, a 5.5 hp difference. Published horsepower is the maker's rating at a stated engine speed. It is a different measure from displacement, and two engines of equal rating can pull differently.
- IS600 Zero Turn Mower has a 10-gauge, Fabricated deck; Spartan RZ-XD has a 5" Deep, Reinforced 7 Gauge Full-Floating Deck deck.
- IS600 Zero Turn Mower carries a 2-year warranty; Spartan RZ-XD 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.
- IS600 Zero Turn Mower has a published top speed of 10 mph; Spartan RZ-XD has a published top speed of 9 mph, a 1 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
3 more differences, calculated figures and what isn’t comparable
Other verified differences
- IS600 Zero Turn Mower cuts from 1.5 in (38 mm) to 4.5 in (114 mm); Spartan RZ-XD cuts from 1.5 in (38 mm) to 4.8 in (121 mm).
- IS600 Zero Turn Mower weighs 942 lbs (427.3 kg); Spartan RZ-XD weighs 907 lbs (411.4 kg), a 35 lbs difference.
- IS600 Zero Turn Mower lists at $9,294; Spartan RZ-XD lists at $9,499, a $205 difference.
Calculated by MowerFacts
- IS600 Zero Turn Mower works out to 3.9 acres/hour; Spartan RZ-XD works out to 3.5 acres/hour, a 0.4 acres/hour difference. Calculated by MowerFacts from deck width and the published top speed at 80% efficiency; it is not a manufacturer figure, and real mowing is slower.
Not comparable
- Voltage: not published for Spartan RZ-XD.
- Displacement: not published for Spartan RZ-XD.
- Transmission: not published for Spartan RZ-XD.
- Fuel Type: not published for Spartan RZ-XD.
- Start Type: not published for Spartan RZ-XD.
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 | IS600 Zero Turn Mower Ferris · Zero-Turn |
Spartan RZ-XD Spartan · Zero-Turn |
|---|---|---|
| List price | $9,294 | $9,499 |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 36.8 ci (603 cc) | — |
| Engine Power | 18.5 hp | 24 hp |
| Engine Make | Kawasaki® FS600V | Kawasaki |
| Fuel Type | Gas | — |
| Cylinders | 2 | — |
| Start Type | Electric | — |
| Electrical | ||
| Voltage | 600 V | — |
| Deck | ||
| Cutting Width | 48 in (1219 mm) | 48 in (1219 mm) |
| Min Cut Height | 1.5 in (38 mm) | 1.5 in (38 mm) |
| Max Cut Height | 4.5 in (114 mm) | 4.8 in (121 mm) |
| Deck Construction | 10-gauge, Fabricated | 5" Deep, Reinforced 7 Gauge Full-Floating Deck |
| Drive | ||
| Transmission | Dual commercial Hydro-Gear® ZT-3200® transaxles with 7" cooling fans | — |
| Ground Speed | 10 mph | 9 mph |
| Drive Tire Size | — | 24x12-12 Reapers |
| Reverse Speed | 5 mph | — |
| Dimensions | ||
| Weight | 942 lbs (427.3 kg) | 907 lbs (411.4 kg) |
| Fuel Capacity | 6 gal (22.7 L) | 9.5 gal (36 L) |
| Length | 80 in (2032 mm) | 84 in (2134 mm) |
| Width | 63 in (1600 mm) | — |
| Height | — | 75 in (1905 mm) |
| Commercial / Pro | ||
| Frame Construction | — | 1.5" by 3" Powder Coated Fusion-Bonded Solid Steel Bridge Frame |
| Seat Type | — | Dymetrol Seat with 360 Degree Floating Seat Platform |
| General | ||
| Warranty | 2 yr | 3 yr |
Where these models differ, explained
IS600 Zero Turn Mower: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — ferrismowers.com.
Spartan RZ-XD: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — joinspartannation.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.