The ideal wheelbarrow wheel depends on the type of terrain you work on and the weight of your usual loads. Most wheels are either air-filled or solid, with many solid versions marketed as "flat-free" or "puncture-proof". 

Pneumatic (air-filled) wheels

This is the most common type of wheelbarrow wheel, filled with air like a bicycle tire.

Best for: General landscaping, gardening, and tasks on grass, gravel, or other uneven surfaces.

Pros:

Smooth ride: Air-filled tires act as shock absorbers, providing a cushioned ride over rough, bumpy ground.

Lightweight: They are generally lighter and require less effort to push.

Cons:

Vulnerable to punctures: The main disadvantage is the risk of flats from nails, glass, and thorns.

Requires maintenance: The air pressure must be checked and maintained, as the tire can go flat over time. 

Flat-free (solid or foam-filled) wheels

These wheels are designed to be puncture-proof and are heavier and more durable than pneumatic tires. 

Best for: Construction sites, farms, or areas with sharp debris, thorns, and other puncture hazards.

Pros:

No maintenance: They never go flat and don't require air pressure checks or repairs.

Durable: They are highly resistant to damage and can handle heavy, sharp materials like concrete and bricks.

Cons:

Firmer ride: Because they lack air cushioning, flat-free wheels provide a firmer ride, which can be less comfortable on rough terrain.

Heavier: The solid construction makes them heavier and can require more effort to push, especially on soft ground.

Products:

Vaunt Heavy Duty Puncture Proof Wheelbarrow Wheel: A solid wheel designed for construction sites and heavy-duty work.

Marathon Industries Flat Free Tire: A popular brand known for its durable, polyurethane flat-free wheels.

Woodside 14” Solid Tyre: A heavy-duty puncture-proof option with a rugged tread, sold with an axle for quick installation.