Compatible Part Number Kubota: Z411KW, Z421KW, K3091-18020 K3091-18030 E es mark: 457211 1-634662 103-5189 103-0064 103-3785 etc. Please make sure you are purchasing the correct tire, ball bearing, and hub size.The Semi-Pneumatic 13x5.00-6 flat-free lawn mower tire is constructed from solid rubber, offers a maintenance-free alternative to traditional air-filled tires. Designed to eliminate the inconvenience of flats, these tires provide consistent performance and durability on various terrains. They maintain their shape and pressure without the need for inflation, ensuring reliable traction and stability for lawn mowers. Ideal for rough or debris-laden landscapes, flat-free tires are resistant to punctures and cuts, making them perfect for prolonged use in demanding conditions. Their robust construction also ensures a smoother ride and reduced downtime, enhancing the overall efficiency of lawn care tasks.