Airless Lawn Mower Tires: Size Chart and Fitment Guide
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The short answer
Read three numbers off the sidewall (e.g. 13x6.50-6 = 13 in tall, 6.5 in wide, 6 in rim), then check your axle bearing (3/4, 5/8 or 1/2 in) and hub width. Match all three and an airless assembly bolts straight on: 13x6.50-6 for most residential zero-turn casters, 11x4.00-5 for smaller casters, 11x6.00-5 for wide forks.
13x6.50-6 Flat Free Front Tires (2 Pack)
The default residential zero-turn caster size — 550 lb rating, with 3/4, 5/8 and 1/2 inch bearings and spacers in the box.
The three checks, in order
- 1Sidewall size — three numbers: overall height x width - rim diameter. All three must match.
- 2Bearing diameter — measure the axle bolt: 3/4 inch on most zero-turn forks, 5/8 and 1/2 inch on lighter machines.
- 3Hub width — measure inside the fork. Centered hubs in the 3.4–4.8 inch range cover most residential mowers; wider commercial forks need an adjustable 5.8–9.1 inch hub.
Get those three right and fitment is a non-issue. Get the size right but the bearing wrong and the wheel wobbles on the axle; get the hub wrong and it binds in the fork or rattles side to side. Good airless assemblies ship with all three bearing sleeves and spacers precisely because these three checks are where people go wrong.
Airless mower tire size chart
| Sidewall marking | Height | Width | Rim | Typical use | Our pick | Price |
|---|---|---|---|---|---|---|
| 13x6.50-6 | 13 in | 6.5 in | 6 in | Most residential zero-turn front casters | 13x6.50-6 Flat Free Front Tires (2 Pack) | Check Price (opens in a new tab) |
| 11x4.00-5 | 11 in | 4 in | 5 in | Smaller casters, walk-behinds, narrow forks | 11x4.00-5 Flat Free Tires (2 Pack) | Check Price (opens in a new tab) |
| 11x6.00-5 | 11 in | 6 in | 5 in | Wide forks, commercial-style casters | 11x6.00-5 Flat Free Tires (2 Pack) | Check Price (opens in a new tab) |
13x6.50-6 — the default residential size
If you own a residential zero-turn, this is probably your front caster size. A 13x6.50-6 airless assembly carries a 550 lb per-tire load rating, arrives as a complete wheel (rim, tire, bearings), and includes 3/4, 5/8 and 1/2 inch bearings plus spacers, so one box fits nearly every fork in this class. It is the size that ends the 'pump the front tire before every mow' routine for most people.
11x4.00-5 — smaller casters and walk-behinds
The narrow, smaller-diameter caster you find on compact zero-turns, some walk-behind mowers and wheeled spreaders. A smooth tread here is the right choice: it will not scuff turf when the machine pivots. Confirm the hub measurement before ordering — narrow forks are where the 3.4–4.8 inch centered hub matters most.
11x6.00-5 — wide forks and heavier front ends
Same rim and height as the 11x4.00-5 but noticeably wider, which spreads load and reduces sinking on soft ground. The adjustable 5.8–9.1 inch hub versions cover commercial-style forks that the residential sizes will not span.
What you give up
- Ride comfort: solid tires transmit more vibration. On rough lawns you feel it in the seat.
- Weight: airless assemblies are heavier, which front casters do not care about.
- Rear wheels: we do not recommend solid tires on driven rear wheels, especially on slopes — traction drops noticeably.
Frequently Asked Questions
- Do airless lawn mower tires really work?
- On front casters, yes — they carry the load fine and the flats stop permanently. On driven rear wheels they cost traction and ride quality, so keep pneumatics there.
- How do I know what size mower tire I need?
- Read the three numbers off the sidewall of the tire you have, then measure the axle bolt diameter and the inside width of the fork. Match all three and fitment is guaranteed.
- What bearing size do zero-turn front casters use?
- Most use 3/4 inch, with 5/8 and 1/2 inch on lighter machines. Universal airless kits include all three sleeves so you fit whichever your axle takes.
- Are airless tires more expensive than replacing tubes?
- Two airless fronts cost roughly what several tube replacements plus your time cost — and then the problem is simply gone.
The Gear We’d Buy
Everything referenced in this guide, in one place.
13x6.50-6 Flat Free Front Tires (2 Pack)
Top pickThe default residential zero-turn caster size — 550 lb rating, with 3/4, 5/8 and 1/2 inch bearings and spacers in the box.
Typically $60 - $90
11x4.00-5 Flat Free Tires (2 Pack)
Small castersSmaller caster size with a smooth tread and a 3.4–4.8 inch centered hub — all three bearing sleeves included.
Typically $45 - $70
11x6.00-5 Flat Free Tires (2 Pack)
Wide forksWider footprint with a 5.8–9.1 inch adjustable hub for commercial-style forks the residential sizes will not span.
Typically $55 - $85
Lawn Tool Hub is reader-supported. We earn a commission from qualifying purchases made through links on this page, at no extra cost to you. Learn more.
Key Takeaways
- Three checks: sidewall size, bearing diameter, hub width.
- 13x6.50-6 fits most residential zero-turn casters; 11x4.00-5 and 11x6.00-5 cover the rest.
- Universal kits include 1/2, 5/8 and 3/4 inch bearings and spacers.
- Airless is a front-caster upgrade — keep pneumatics on driven rears.
Reviewed by
The Lawn Tool Hub Test Bench
We buy, borrow and break lawn tools on our own yards — clay in the back, sand-cut Bermuda in the front — and write down what actually changed the result.
Keep reading
Zero Turn Mower Tires: What to Replace Front and Rear With
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Top pick
13x6.50-6 Flat Free Front Tires (2 Pack)