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 D21d — commercial: daily paid use and high acreage; 52-inch deck
- Walker Walker Model B27i — commercial: daily paid use and high acreage; 74-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- Walker Model D21d uses a Kubota engine; Walker Model B27i uses a Rehlko 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 D21d weighs 1,001 lbs (454 kg); Walker Model B27i weighs 606 lbs (274.9 kg), a 395 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What Walker Model D21d's weight means for a trailer ›
- Walker Model D21d has a 52 in (1,321 mm) deck; Walker Model B27i has a 74 in (1,880 mm) deck, a 22 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 ›
- Walker Model D21d has a 20.9 hp engine; Walker Model B27i has a 26.5 hp engine, a 5.6 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 D21d has a published top speed of 6.5 mph; Walker Model B27i has a published top speed of 8 mph, a 1.5 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
2 more differences, calculated figures
Other verified differences
- Walker Model D21d cuts from 1 in (25 mm) to 4 in (102 mm); Walker Model B27i cuts from 1.5 in (38 mm) to 4 in (102 mm).
- Walker Model D21d has a 43.9 ci (719 cc) engine; Walker Model B27i has a 45.6 ci (747 cc) engine, a 1.7 ci difference.
Calculated by MowerFacts
- Walker Model D21d works out to 2.7 acres/hour; Walker Model B27i works out to 4.8 acres/hour, a 2.1 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.
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 D21d Walker · Commercial |
Walker Model B27i Walker · Commercial |
|---|---|---|
| List price | dealer quote | dealer quote |
| Engine | ||
| Power Source | diesel | gas |
| Engine Make | Kubota | Rehlko |
| Displacement | 43.9 ci (719 cc) | 45.6 ci (747 cc) |
| Engine Power | 20.9 hp | 26.5 hp |
| Fuel Type | Diesel (2-D) | Automotive Grade Unleaded Gasoline (87 Octane Minimum, 10% Ethanol Maximum) |
| Deck | ||
| Cutting Width | 52 in (1321 mm) | 74 in (1880 mm) |
| Min Cut Height | 1 in (25 mm) | 1.5 in (38 mm) |
| Max Cut Height | 4 in (102 mm) | 4 in (102 mm) |
| Drive | ||
| Transmission | Dual Hydrostatic Eaton Model 7 transmission with ductile cast iron final drive, Each Wheel Independently Driven | Dual, Independent Hydro-Gear® ZT3100 Integrated Transaxles |
| Ground Speed | 6.5 mph | 8 mph |
| Dimensions | ||
| Weight | 1001 lbs (454 kg) | 606 lbs (274.9 kg) |
| Fuel Capacity | 4.7 gal (17.8 L) | 4.7 gal (17.8 L) |
Walker Model D21d: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — walker.com.
Walker Model B27i: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — walker.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.