Check the listing for details. Marastar Flat-Free Universal Tire Assembly, 2-Pack, 13/5.00-6, Model# 02071-NTE. Condition: New. Listed at 39.99 USD. The 2 Pack Marastar 13x.500-6 Universal Fit Flat Free Tire Assembly is the perfect utility cart and hand truck tire replacement. This pair of easy to install replacements come with a chevron tread pattern, flat free tires mounted on powder-coated steel wheels with the most common specs and include an adpater kit for a more customized fit. These flat free tires offer a smooth ride and eliminate the hassle of flat tires. No need to change out an old tube or visit a professional tire shop, simply replace the entire old or damaged tire and wheel assembly with this pair of flat free tire assemblies.