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.
- Scag RC Extreme Slope Mower — commercial: daily paid use and high acreage; 52-inch deck; gas powered
- Exmark Vertex X-Series (52 in EFI) — commercial: daily paid use and high acreage; 52-inch deck; gas powered
What’s different? The 4 differences that matter most, from the published figures.
- RC Extreme Slope Mower lists at $57,900 to $59,750; Vertex X-Series (52 in EFI) lists at $16,599, a $41,301 difference. List price is the maker's own figure before tax, freight and dealer setup. Dealers set the final price.
- RC Extreme Slope Mower has a published top speed of 3 mph; Vertex X-Series (52 in EFI) has a published top speed of 12 mph, a 9 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
- RC Extreme Slope Mower cuts from 3.5 in (89 mm) to 11.5 in (292 mm); Vertex X-Series (52 in EFI) cuts from 1.5 in (38 mm) to 5 in (127 mm). The cut-height range is the shortest and tallest cut the deck offers. Most lawns are kept well inside it.
- RC Extreme Slope Mower has a 37 hp engine; Vertex X-Series (52 in EFI) has a 38.5 hp engine, a 1.5 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.
calculated figures and what isn’t comparable
Calculated by MowerFacts
- RC Extreme Slope Mower works out to 1.3 acres/hour; Vertex X-Series (52 in EFI) works out to 5.0 acres/hour, a 3.8 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
- Displacement: not published for Vertex X-Series (52 in EFI).
- Weight: not published for Vertex X-Series (52 in EFI).
- Fuel Capacity: not published for RC Extreme Slope Mower.
- Drive System: not published for Vertex X-Series (52 in EFI).
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 | RC Extreme Slope Mower Scag · Commercial |
Vertex X-Series (52 in EFI) Exmark · Commercial |
|---|---|---|
| List price | $57,900–$59,750 | $16,599 |
| Engine | ||
| Power Source | gas | gas |
| Engine Make | Vanguard BIG BLOCK™ V-Twin EFI engine with ETC with Oil Guard | Kawasaki FX1000V |
| Displacement | 60.6 ci (993 cc) | — |
| Engine Power | 37 hp | 38.5 hp |
| Deck | ||
| Cutting Width | 52 in (1321 mm) | 52 in (1321 mm) |
| Min Cut Height | 3.5 in (89 mm) | 1.5 in (38 mm) |
| Max Cut Height | 11.5 in (292 mm) | 5 in (127 mm) |
| Drive | ||
| Ground Speed | 3 mph | 12 mph |
| Drive System | Electric Drive (No PTO) | — |
| Dimensions | ||
| Weight | 2400 lbs (1088.6 kg) | — |
| Fuel Capacity | — | 14 gal (53 L) |
| Length | 75.4 in (1915 mm) | — |
| Width | 70 in (1778 mm) | — |
Where these models differ, explained
RC Extreme Slope Mower: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — scag.com.
Vertex X-Series (52 in EFI): Specs verified against the manufacturer spec sheet on Jun 6, 2026 — exmark.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.