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.
- Walker Walker Model S18 — commercial: daily paid use and high acreage; 56-inch deck; gas powered
- Exmark Radius E-Series (RDE 54 in) — commercial: daily paid use and high acreage; 54-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- Walker Model S18 uses a Briggs & Stratton Vanguard engine; Radius E-Series (RDE 54 in) uses a Kawasaki FR691 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.
- Walker Model S18 holds 4 gal (15.1 L) of fuel; Radius E-Series (RDE 54 in) holds 7 gal (26.5 L) of fuel, a 3 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.
- Walker Model S18 has a 18 hp engine; Radius E-Series (RDE 54 in) has a 23 hp engine, a 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.
- Walker Model S18 cuts from 1 in (25 mm) to 4 in (102 mm); Radius E-Series (RDE 54 in) 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.
- Walker Model S18 has a 56 in (1,422 mm) deck; Radius E-Series (RDE 54 in) has a 54 in (1,372 mm) deck, a 2 in difference. Deck width sets how much grass each pass covers. Mowing time also depends on ground speed, turns and obstacles, so a wider deck alone does not fix the job's length. Time both decks on your own lawn ›
what isn’t comparable
Not comparable
- Displacement: not published for Radius E-Series (RDE 54 in).
- Weight: not published for Radius E-Series (RDE 54 in).
- Ground Speed: not published for Walker Model S18.
- Transmission: not published for Radius E-Series (RDE 54 in).
- Fuel Type: not published for Radius E-Series (RDE 54 in).
- Price: Walker Model S18 is dealer quote only.
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 | Walker Model S18 Walker · Commercial |
Radius E-Series (RDE 54 in) Exmark · Commercial |
|---|---|---|
| List price | dealer quote | $6,999 |
| Engine | ||
| Power Source | gas | gas |
| Engine Make | Briggs & Stratton Vanguard | Kawasaki FR691 |
| Displacement | 34.8 ci (570 cc) | — |
| Engine Power | 18 hp | 23 hp |
| Fuel Type | Regular grade unleaded gasoline (87 octane minimum, 10% ethanol maximum) | — |
| Deck | ||
| Cutting Width | 56 in (1422 mm) | 54 in (1372 mm) |
| Min Cut Height | 1 in (25 mm) | 1.5 in (38 mm) |
| Max Cut Height | 4 in (102 mm) | 5 in (127 mm) |
| Drive | ||
| Transmission | Dual, Independent Hydro-Gear® ZT3100 Integrated Transaxles | — |
| Ground Speed | — | 8 mph |
| Dimensions | ||
| Weight | 675 lbs (306 kg) | — |
| Fuel Capacity | 4 gal (15.1 L) | 7 gal (26.5 L) |
Where these models differ, explained
Walker Model S18: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — walker.com.
Radius E-Series (RDE 54 in): 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.