5-inch diameter steel rim with 1-3/4-inch offset hub, ball bearings and 1/2-inch bore
1-3/4-inch wide X 8-inch diameter semi-pneumatic tire with ribbed tread
88-lb load capacity
These tires are ideal for hand trucks, lawnmowers, utility carts, and other lawn and garden equipment
Semi-pneumatic tires are light weight, puncture proof, and provide cushioning. They are designed to not pull away from their rim under use.
From the Manufacturer

The wheels are made of strong yet economical rust free plastic hubs, sturdy ball bearing steel hubs for more demanding applications, and pneumatic tires.