Libra 2 New 10" Flat Free Solid Tire Wheel for Dolly Handtruck Cart -27019 Durable, lightweight 100% flat-free, solid polyurethane tire, perform like air tire but never go flat Overall tire diameter: 10", section width: 3-1/4" Steel hub diameter: 5" Center bore ID: 5/8" with ball bearings 300 LBS capacity each