These dock carts feature a 20 inch plastic rim with polyurethane tire. Lightweight plastic wheels will not rust or rot. Urethane tires and sealed bearings ensure a smooth ride over rough surfaces. Tub Dimensions 44"L x 24"W x 14"H Overall Cart Dimensions 58"L x 32"W x 24"H Weight Capacity 300 lbs. Tub Volume 7 Cubic Ft. Liquid Capacity 50 Gallons Tub Construction Plastic (high density polyethylene) Frame Construction Zinc Coated (Galvanized) Steel Wheel Construction 20" plastic rim with replaceable urethane tire, sealed bearings Axle Construction Zinc coated 5/8" steel with threaded ends