X430 vs X450: Which Navimow Do You Actually Need?

The question I hear more than any other: "What's the real difference between the X430 and X450?"

Short answer: $500 and half an acre.

Long answer: These are the same mower. Same battery (12.8 Ah), same runtime (~110 minutes per charge), same 17-inch dual-disc cutting deck with 12 blades, same 84% (40°) slope handling, same Xero-Turn AWD, same VisionFence 360° obstacle avoidance, same EFLS 3.0 navigation, same 68 dB operation, same IP66 build. Identical.

Both use the same navigation system, so tree cover is worth considering whichever model you choose. Our guide explains how RTK and LiDAR navigation compare and what that means for your lawn.

The difference is coverage: the X430 handles up to 1 acre, the X450 goes to 1.5. That's it. That's the \$500.

So which should you buy?

Measure your actual mowable lawn — not your lot size. Walk it off or check satellite imagery, then subtract the house, driveway, garden beds, pool, and woods. What you're left with is the number that matters.

Under 1 acre mowable: Buy the X430. You're getting flagship X450 hardware for \$500 less. There's no reason to pay for coverage you won't use.

1 to 1.5 acres mowable: Buy the X450. Running any mower at its absolute coverage limit means longer mow times and more charge cycles. The headroom is worth it.

Over 1.5 acres: You're in TerraNox territory. Look at the CM120M1 (3 acres) or CM240M1 (6 acres) instead of trying to stretch a residential mower past its design.

One more thing: don't guess. Fill out our form for a free yard analysis — we'll measure your mowable acreage from satellite, check your slopes and tree cover, and tell you straight which machine fits. No obligation, no sales pitch.