Marathon 400 x 6 in. Inner Tube is designed to fit tires with a width of 4 inches and a sidewall height of 4 inches, ly matching a 6-inch wheel diameter. This inner tube features a straight valve stem for easy inflation and reliable performance. I for maintaining optimal tire pressure and ensuring a smooth ride, this tube combines durability with precise fitment for your tire needs. Model Number: 490-328-0005