Carlisle Assembly Lawn & Garden Tire - 9X3.50-4 9x350x4 Flat Free Lawn Mower Tire - Carlisle Reliance 211cm Flat Proof Tire for Grasshopper Smooth tread, 3.25" center hub wheels with 3/4 roller bearings These assemblies fit Kubota, Gravely and some Ariens walk behind commercial mowers