NoAir® (2) Flat Free Tire Assemblies 11x4.00-5 Fits Kubota Z100 Series K3011-18020

What It Is

The NoAir® 11x4.00-5 flat free tire assemblies are a direct replacement set of two tires and wheels designed for zero-turn mowers, specifically the Kubota Z100 series. They eliminate flats and maintenance by using a solid foam core instead of air, ideal for rough terrain or debris-heavy properties.

Fitment & Compatibility

• Model Check: Confirmed fit for Kubota Z100 series (Z121S, Z125S, Z122R, Z127S, Z142S, etc.) and other mowers using the OEM part number K3011-18020.
• Size: Tire size 11x4.00-5 (11-inch outer diameter, 4.00-inch width, 5-inch wheel hub). Measure your existing tire to confirm.
• Bolt Pattern: 4-bolt, 4-inch center (common on many zero-turn front wheels). Verify your wheel stud pattern matches before ordering.
• Deck Clearance: Flat free tires are slightly heavier and less flexible than pneumatic—check that your deck or frame doesn’t rub at full turn.
• Aftermarket Use: May also fit some Exmark, Toro, or John Deere models with the same size and bolt pattern, but Kubota Z100 is the stated match.

Key Things to Know

• No Maintenance: No air means zero flats, no pressure checks, and no valve stems to fail. Ideal for thorny or rocky yards.
• Installation Difficulty: Easy bolt-on for most owners—just remove old tire, swap onto hub, and tighten lug nuts. No special tools needed.
• Ride Quality: Stiffer than pneumatic tires—expect a firmer ride on uneven ground. Not recommended for turf if you need cushioning.
• Weight Difference: Each assembly weighs about 8-10 lbs vs 5-6 lbs for a standard pneumatic. This may slightly affect steering effort on steep slopes.

Should You Buy It

Buy these if you’re tired of fixing flats on your Kubota Z100 front tires, mow over thorns or debris regularly, or want a zero-maintenance solution. Skip them if you need a cushioned ride for delicate lawns or operate on very uneven terrain—the stiffness can be jarring. For most commercial or heavy residential users, the trade-off is worth the reliability.