Easy to install. Solid polyurethane tire on steel rim is 14.5" diameter with 3" hub length, 5/8" bushing. Spacer/bushing kit included for alternate hub and axle sizes. 300 lb. weight capacity. This tire does include two 1" wheel spacers and four 1/2" wheel spacers to accommodate various hub sizes. It also includes two 3/4" ball bearings.