Does adding more blades unbalance the cutting disc?

No. The three extra positions are factory-drilled holes, spaced symmetrically between the six stock blades — this isn't drilling or modifying the disc, it's using mounting points that are already there. And because Navimow blades are free-pivoting rather than rigidly bolted, three more of them barely changes the disc's rotating mass.

Does the 18-blade setup void the Navimow warranty?

You're using Segway's own blades in Segway's own mounting holes, so it's closer to a configuration change than a modification — but we're a dealer, not Segway, and we can't promise how a future warranty claim would view it. If that concern matters to you, run the mod on a mower that's past its warranty period or ask Segway support directly first.

What should I change after adding more blades?

Two things. Raise your cutting height one or two settings — with 50% more cutting edge the mower removes material faster, and a low setting can scalp on uneven ground; step back down once you've seen a few cycles. Then walk the yard and re-check obstacles: with nine blades per disc the mower is more likely to contact rocks, roots, edging and sprinkler heads it previously skimmed past, so adjust no-go zones if needed.

Can You Add More Blades to a Segway Navimow? Yes — 18 of Them

Q: Can you add more blades to a Segway Navimow?

Yes. Every Navimow cutting disc has nine factory-drilled mounting points, but Segway only populates six of them. Under the protective cover on each disc are three unused screw holes, evenly spaced between the stock blades. Mount an OEM blade in each and you're running 9 blades per disc — 18 total instead of 12, a 50% increase in cutting edge with no other changes to the mower.

One of the most common questions we get from Navimow owners is some version of “the cut looks fine, but it’s not crisp — is there anything I can do?” There is, and it costs about as much as a spare blade pack.

Every Navimow ships with 6 blades per cutting disc, 12 in total. But the discs are drilled for more. Under the protective cover on each disc are three unused screw holes. Fill them and you’re running 9 blades per disc, 18 total: a 50% increase in cutting edge with no other changes to the mower.

We’ve run this setup on our own demo units, and a number of Zippy Lawnz customers have done it on theirs. The feedback is consistent: a cleaner, more even finish, especially on the kinds of grass a robot mower normally struggles with. The full walkthrough is in the video above.

Who should add more blades?

This mod helps most if you recognize any of these:

You cut Bermuda or another warm-season grass low, and every missed blade shows.
Your lawn has grass that leans or lays flat after wind or rain. A standard disc tends to push it over rather than cut it.
You get stragglers — a thin weed here, a tall stalk there — that survive multiple mower passes.
You’d like a better finish without mowing more often.

If your lawn already looks the way you want, you can skip this. Six blades per disc is what Segway ships for a reason, and for most yards it’s plenty.

What’s actually under the protective cover?

The cutting discs on a Navimow have nine mounting points. Segway populates six of them and covers the disc with a guard. The three extra positions are spaced evenly between the factory blades — this isn’t a hack that unbalances the disc, it’s using mounting holes that are already there and already symmetrical.

Because the blades are free-pivoting, adding three more doesn’t change the disc’s rotating mass much. What it changes is coverage: on every rotation, there are 50% more edges passing through the grass, so less escapes between blades.

How do you do the 18-blade mod?

What you need:

One pack of Segway Navimow OEM blades (a standard pack covers both discs with spares)
A screwdriver or driver bit that fits the blade screws

Steps:

Turn the mower off and flip it over on a soft surface.
Unscrew and remove the protective cover from the first cutting disc.
Locate the three empty screw holes between the existing blades.
Mount a blade in each, using the new screws from the pack — tightening to the same feel as the factory blades: snug, still able to pivot.
Spin the disc by hand. Every blade should swing freely and nothing should contact the housing.
Repeat on the second disc, flip the mower back over, and run a test cycle.

Budget ten to fifteen minutes.

Use OEM blades. We tested titanium-coated aftermarket blades against the Navimow originals with a laser edge reader and a scale. The OEM blades were sharper and heavier. Read that comparison here.

What should you adjust afterward?

1. Raise your cutting height a notch. More cutting edge means the mower removes material faster, and on uneven ground a low setting can scalp. Start one or two settings higher than you were running, then step back down once you’ve seen a few cycles.

2. Re-check your obstacles. With nine blades per disc, the mower is more likely to make contact with things it previously skimmed past: rocks, roots, edging, sprinkler heads, tree-ring borders. Walk the yard before your first full run and adjust no-go zones if needed.

Neither of these is a dealbreaker. They’re the same things you’d think about after any change that makes a mower cut more aggressively.

Does it void the warranty?

You’re using Segway’s own blades in Segway’s own mounting holes, so this is closer to a configuration change than a modification. That said, we’re a dealer and not Segway, so if you have a warranty claim down the road, the honest answer is that we can’t promise how it’ll be viewed. If that concern matters to you, run the mod on a mower that’s past its warranty period or ask Segway support directly before you do it.

Get help with your robot mower

Zippy Lawnz is an authorized dealer and service center for Segway Navimow, Mammotion, and Yarbo, with nationwide sales and remote support and hands-on installs across Pennsylvania, Maryland, Delaware, Virginia, and Colorado. We stock OEM blades, and if you’d rather have us do the swap during a service visit, get in touch.

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📞 Call or Text Us: 410-725-7500

The mod: 6 → 9 blades per disc using factory holes · Cost: one OEM blade pack · Time: 10–15 minutes · Result: 50% more cutting edge · Afterward: raise the cut height a notch, re-check obstacles