Maker
Segway
6 models with published specs, from 0.15 to 2.5 acres and 30% to 84% grade. Ranked by rated area, because that is the spec that rules machines out first.
Area range0.15–2.5 ac
Grade range30–84%
SteepestNavimow X450
Verified specs6 of 6
Sold viaOnline retail
The range
Navimow X3902.5 ac · 50% · RWD
Navimow X4501.5 ac · 84% · 4WD
Navimow X4301 ac · 84% · 4WD
Navimow i210 AWD0.25 ac · 45% · AWD
Navimow i110N0.25 ac · 30% · 2WD
Navimow i206 AWD0.15 ac · 45% · AWD
Where the range runs out
The largest Segway we have specs for is the Navimow X390 at 2.5 acres. Allowing the quarter more that real lawns need for borders and travel paths, that covers 1/4 acre, 1/2 acre, 1 acre, 2 acres. For 3 acres or 5 acres you need another maker.
On grade, the Navimow X450 tops the range at 84% — 40°, not 84°. That is genuinely steep ground, and few makers reach it.