Kartio 13" 4.00-6 Solid Flat-Free Wheel Assembly for Gorilla Cart & Wheelbarrow — Polyurethane, Sealed Bearings

This Kartio 13" (4.00-6) flat-free solid tire and wheel assembly replaces puncture-prone tires for wheelbarrows, Gorilla Carts, garden wagons and utility trolleys with durable, maintenance-free performance.

Swap worn pneumatic wheels for a maintenance-free solid polyurethane wheel that resists flats and carries heavy loads. The Kartio 4.00-6 assembly combines a dense polyurethane tire, a reinforced steel hub, and sealed bearings so you can move tools, soil and gear without pausing to patch tubes or chase air leaks.

Will this wheel fit my Gorilla Cart or garden cart?

The Kartio 13" 4.00-6 is engineered as a common replacement size that adapts to many utility carts and small equipment hubs. The kit ships with bearings, spacers and fasteners so you can tune fitment for different hub widths.

• 13-inch outer diameter and 3.4-inch tread width for standard 4.00-6 applications
• Preinstalled 5/8" bearing bore, includes four 3/4" bearings and cotter-pin hardware
• Adjustable hub accommodation from approximately 1.8" up to 5.8" with supplied spacers
• Compatible with wheelbarrows, Gorilla Carts, hand trucks, dump carts and garden wagons

How durable and heavy-duty is this solid tire?

Made from high-density polyurethane foam bonded to a 1.2 mm thick steel hub, this wheel resists flats while holding substantial loads. Kartio rates the assembly to support up to about 400 pounds under normal use, making it suitable for heavy yard and jobsite chores.

• High-density polyurethane construction resists punctures and abrasions
• 1.2 mm hub thickness for improved structural strength
• Load capacity around 400 lbs for single-wheel applications
• Designed for repeated outdoor use on rough surfaces

What traction and bearing features help performance?

The tire uses a sawtooth tread pattern that improves grip on loose or uneven ground while remaining easy to roll on hard surfaces. Double-sealed bearings reduce contamination from dust and water, helping the wheel turn smoothly with less maintenance.

• Sawtooth tread for enhanced traction and directional control
• Double-sealed bearings for longer life and smoother rotation
• Dust- and water-resistant seals to protect internal parts
• Low rolling resistance for easier towing and pushing under load

What hardware is included and how do I install it?

The package contains the assembled wheel plus a selection of bearings, spacers and fastening hardware so you can adapt the wheel to different axle lengths. Installation is straightforward with basic tools and the supplied parts for most utility carts.

• Includes 4 bearing pieces (3/4"), 2 short and 2 longer spacers, 4 washers and 4 cotter pins
• Preinstalled 5/8" bearing seat, permitting straightforward axle fitment
• Adjust hub spacers to match your existing axle length (1.8"–5.8" range)
• Simple swap: remove old wheel, mount Kartio wheel with spacers and secure with cotter pin

Who is this for: This solid 13" Kartio wheel is aimed at homeowners, landscapers and contractors who want a low-maintenance replacement for puncture-prone pneumatic tires. It suits anyone using Gorilla Carts, wheelbarrows, garden wagons, hand trucks or small utility trolleys who needs reliable traction, sealed bearings and higher load tolerance without frequent repair or inflation.