X420
Segway's large-lawn flagship: four-wheel drive with dual suspension for 84% slopes, a 430 mm twin-disc deck with two 180 W motors, network RTK with a 360° camera and 120 zones, for 2,000 m² at €2,499.
Review method: Specification analysis
Our verdict
The X4 is the first Navimow built for ground that fights back. Four driven wheels on twin suspensions, steering by eccentric front wheels that Segway says do not tear the turf, an 84% slope rating and a 7 cm vertical step put it ahead of every Mammotion here on paper, and the 430 mm deck with two 180 W motors and twelve blades cuts as wide as anything in the catalogue. Positioning is network RTK fused with a 360° camera and visual odometry. There is no LiDAR, but the same camera drives obstacle detection with a ToF sensor and 200+ object types. The X420 is the 2,000 m² version: a 10 Ah battery, 675 m² and 90 minutes a charge, 75 minutes to recharge, one year of cellular data included. It weighs 28.8 kg, measures 85 cm long, runs at 68 dB and lists no passage width, which is the honest way of saying this is a machine for open ground rather than a cottage garden.
Pros
- 84% slope rating on four-wheel drive with dual suspension, and a 7 cm vertical step
- 430 mm twin-disc deck, two 180 W motors, 20 to 95 mm cutting height
- Network RTK with a 360° camera, no antenna to install; 120 zones
- Rain sensor plus weather forecast, IP66, three-year warranty
- Cut-to-edge mowing, GPS tracking, PIN code and a 3.5-inch screen
Cons
- 28.8 kg and 85 cm long, with no passage width stated
- 68 dB, the loudest Navimow
- No LiDAR: positioning needs satellites, with the camera as backup
- Cellular data is free for one year, then €29.90 a year
Best for
- Large, sloped or rough lawns around 2,000 m²
- Thick grass and long cutting heights that a 220 mm deck cannot manage
Not recommended for
- Small gardens with narrow passages
- Heavily wooded plots, where satellite positioning has no LiDAR to fall back on
Score breakdown
- Navigation
- 98
- Cutting
- 99
- Terrain
- 100
- Obstacle Avoidance
- 85
- Ease of Use
- 100
- Reliability
- 84
- Features
- 90
- Value
- 52
Specifications
Coverage
- Max lawn area
- 2,000 m² (0.49 acres)
- Zones
- 120
Navigation
- Navigation
- RTK-GNSS + vision
- Boundary wire
- Not required
- Obstacle avoidance
- 3D time-of-flight
Cutting
- Cutting width
- 430 mm
- Cutting height
- 20–95 mm
- Edge cutting
- Yes
Terrain
- Max slope
- 84% (40°)
- Drivetrain
- AWD
Power
- Battery
- Not published
- Runtime
- 1 h 30 min
- Charging time
- 1 h 15 min
Connectivity
- Wi-Fi
- Yes
- Bluetooth
- Yes
- 4G / LTE
- Yes
- GPS
- Yes
Physical
- Weight
- 28.8 kg
- L × W × H
- 850 × 610 × 351 mm
- Noise
- 68 dB
- Weather sealing
- IP66
Support
- Warranty
- 36 months
- Released
- Not published
Power
- Area per charge
- 675 m²
- Mowing rate
- 450 m²/h
- Time for the rated area
- 8 hours
- Battery warranty
- 2 years
Connectivity
- Cellular plan
- 1 year free, then €29.90 a year
- On-device display
- 3.5-inch colour LCD
- Smart home
- Alexa, Google Home
Terrain
- Vertical step
- 7 cm
- Steering
- Eccentric front wheels, two steering motors, dual suspension
Cutting
- Cutting motors
- 2 × 180 W
- Floating deck and anti-clogging discs
- Yes
- Cutting height adjustment
- From the app
Obstacles
- Recognised object types
- 200+
- Depth sensing
- ToF sensor alongside the 360° camera
Navigation
- GNSS antenna in the box
- Optional local base station instead of network RTK
Segway Navimow EU 'Spec & Compare' table, X420 column, retrieved 2026-09-09
Where to buy
Retail prices are not tracked yet. This is the manufacturer's published list price. RoboVerdict may earn a commission when you buy through links on our site. This does not affect our rankings.
Top picks
- Segway Navimow89
X450
The 5,000 m² Navimow X4: four-wheel drive with dual suspension for 84% slopes, a 430 mm deck with two 180 W motors, a 15 Ah battery for 1,300 m² a charge and two years of cellular data, for €3,199.
- Mammotion87
LUBA mini 2 AWD 1000
All-wheel-drive mower for 1,000 m² with network RTK and three cameras, an 80% slope rating and a second disc that cuts to 5.5 cm from a wall.
- Mammotion86
LUBA 3 AWD 3000
The LUBA 3 for 3,000 m²: all-wheel drive on 80% slopes, a 400 mm deck with 165 W motors, 360° LiDAR, network RTK and two cameras together, 1,400 m² a charge, for €2,699.