Marathon 8" Swivel Caster With Flat Free Tire Product Description Marathon Flat Free tires provide the bounce and load handling characteristics similar to an air-filled tire with the benefit of never going flat. From the Manufacturer Eliminate downtime, 8-Inch solid polyurethane flat free tire mounted in a steel swivel caster with 4-Inch x 4.5-Inch mounting bracket. No flat tires have the same bounce, feel, cushioning, and performance as a regular air-filled or pneumatic tire. They are also non-marking and will not be affected by ozone or UV rays. Airless Tires are made of lightweight, solid polyurethane foam and are guaranteed to never go flat. 2.80/2.50-4" tire mounted on a Swivel caster. 8" Tire Diameter. 10" overall height from mounting bracket to edge of tire. Flat Free Tire made of solid, polyurethane foam. Non-marking. Sawtooth Tread. Caster plate dimensions 4.0" x 4.5" Perfect caster for small equipment, carts, etc. 275 lb load capacity. Not for highway use.