Segway Navimow X4 Series
The Navimow X4 is the mower to beat for large, open properties. The X450 covers 1.5 acres, the X430 covers one, and both recharge in about 90 minutes. Its 84% slope rating and all-wheel drive handle rough ground. Lots dominated by trees are better served by the LUBA 3.
Key specs
| Spec | Navimow X4 |
|---|---|
| Price | From $2,499 |
| Lawn size | 1.0 acre (X430) or 1.5 acres (X450) |
| Max slope | 84% (40°) on the X430 |
| Cutting width | 17 in |
| Cutting height | 0.75–4.0 in |
| Navigation | Network RTK + 360° visual SLAM + AI vision |
| Drive | All-wheel drive with front steering |
| Extras | Built-in 4G, IP66, under 68 dB(A), up to 120 zones, 90-minute recharge |
Maker specs and prices as of November 3, 2026. "Not listed" means the maker doesn't publish that figure.
X430 or X450
| Model | Lawn size | Price | Connect+ service |
|---|---|---|---|
| X430 | 1.0 acre | $2,499 | 1 year free, then $32.90/yr |
| X450 | 1.5 acres | $2,999 | 2 years free, then $32.90/yr |
Garage bundles add $349.99 to either model.
Built for coverage
A 17 in dual-disc deck with 12 pivoting blades, travel speed up to 2.6 ft per second and up to 9,600 sq ft per charge make the X430 the most productive mower on our list. Twin 180W motors and 224W charging get it back on the lawn in 90 minutes or less.
Cutting height runs from 0.75 to 4 in in quarter-inch steps, so it suits both short warm-season grass and tall fescue.
Navigation
Tri-frequency network RTK provides satellite positioning without an antenna (one is included for weak-signal areas). 360° visual SLAM and AI vision handle obstacle avoidance, recognizing more than 200 obstacle types. Auto Mapping builds the first map for you, and GeoSketch lets you edit it on a real-scene image.
Terrain
Front-wheel steering, all-wheel drive and dual suspension give it an 84% (40°) slope rating and 2.8 in obstacle crossing on the X430. That's steeper than most riding mowers can safely handle.
This review is based on Segway Navimow's published specifications, independent coverage and owner reports, compared against the other mowers we track. We'll add hands-on results as our testing progresses.
Questions
Does the X4 need an antenna?
Network RTK works without one in most areas. Segway includes a GNSS antenna for yards where cellular corrections aren't enough.
How loud is it?
Segway rates it under 68 dB(A), louder than the small i-series mowers because of the larger deck, but far quieter than a gas mower.