Each RubberMaster 14x6/F78-14 6P 5-on-4.5 Modular Tire/Wheel Assembly pairs a top performance, long life RubberMaster tire matched with a tough, virtually indestructible SteelMaster steel rim, precision fitted, mounted and balanced with a valve installed. Just tighten the lug nuts and go for the enhanced ride comfort, handling and safety characteristics you need on the road. Get the trailer tire and rim assemblies you need with the sizes, load capacities, tread and bolt patterns you want to provide stability, sway control and low-rolling resistance for your trailer. When it comes to convenience, time and money savings and safety, this is the way to go. Keep your vehicle ready to hit the road by having this tire/wheel assembly in case of emergencies.