Application 1 — outdoor yard and plant transport
Rough surface, mixed terrain
Yard carts, plant transfer over broken ground
Equipment that moves between buildings, across yards, over the broken asphalt and gravel transitions that every older industrial site has. The air-filled tire bridges the surface irregularities a hard wheel would catch on. This is the core use case — if the route includes any unpaved or degraded surface, this is the caster category.
Application 2 — dock and loading equipment
Dock-plate gaps, threshold transitions
Dock carts, trailer-loading equipment
Loading docks are full of gaps and lips — the dock-plate seam, the trailer threshold, the leveler hinge. An air-filled tire rolls over them without the jolt that a hard wheel transmits into the load. Critical when the load is fragile or when operator fatigue from repeated impacts is a real cost.
Application 3 — shock-sensitive load transport
Vibration isolation
Instrument, electronics, and delicate-assembly carts
Sometimes the floor is fine but the load can't take vibration. Air-filled tires act as a suspension — the compressed-air cushion isolates the load from floor-seam shock and rolling vibration. Used for instrument transport, sensitive electronics, and partially-assembled equipment that hasn't been secured yet.
Application 4 — high-capacity rough-terrain platforms
Up to 7,600 lb · dual wheel
Heavy outdoor platforms and trailers
At the top of the range, dual-wheel air-filled casters carry up to 7,600 lb per caster while still riding on a cushion. Heavy outdoor staging, construction-site equipment platforms, agricultural implement carts. The dual-wheel build adds the stability a single tire can't give at this load.
Wheel size and capacity across the range
| Wheel |
Config |
Capacity |
Where it fits |
| 8–10″ |
Single |
300–800 lb |
Light yard carts, dock equipment |
| 12–16″ |
Single |
800–2,000 lb |
Mid-weight outdoor transport |
| 18″ |
Dual |
~3,600 lb |
Heavy outdoor platforms |
| 21″ |
Dual |
~5,600 lb |
Heavy rough-terrain trailers |
| 25″ |
Dual |
~7,600 lb |
Maximum-capacity rough-terrain transport |
The puncture trade-off — and the fix — Air-filled tires can go flat. On a route with glass, metal shavings, staples, or thorns, that's a real uptime risk. The fix is a foam-filled option — the tire is filled with a resilient foam instead of air, so it keeps most of the cushion-ride benefit but cannot puncture. Spec foam-fill anywhere downtime from a flat would be expensive. Spec true air-fill where the ride quality matters most and the surface is clean enough.
Air-filled caster FAQs
Air-filled or foam-filled — how do I decide?Air-filled for the best ride on clean rough surfaces. Foam-filled when the route has puncture hazards (glass, metal, staples) and a flat would cost real downtime. Foam keeps most of the cushion benefit with zero puncture risk.
What pressure should the tires run?Each tire has a rated pressure on the sidewall — running under-pressure kills capacity and accelerates wear, over-pressure loses the cushion ride. Check pressure as part of regular equipment maintenance.
Why is the capacity lower than a solid wheel the same size?The air cushion that gives the smooth ride also flexes under load. That flex is the trade-off — you accept lower capacity per wheel in exchange for shock absorption a solid wheel can't provide.
Can these be used indoors?Yes — on smooth indoor floors they ride quiet and protect the load, but you're carrying capacity and rolling-resistance penalties you don't need. Indoors on smooth concrete, a polyurethane wheel is usually the better pick unless vibration isolation is the goal.
Single wheel or dual wheel?Single wheel below ~2,000 lb for maneuverability. Dual wheel above that for stability and to spread the load — the 18″, 21″, and 25″ high-capacity builds are all dual-wheel.
Match the tire to the terrain
Tell us the surface, the load per caster, and whether puncture hazards are on the route. We'll match air-fill or foam-fill and the right wheel size.
Call 844-439-4335
