The straight valve innertube has a high percentage of butyl rubber for greater elasticity， air tightness， and insulation. A consistent extrusion process eliminates the \"thin wall\" problem of other innertubes. The innertube is 3.5 inches x 4.0 inches with a rim diameter of 8 inches. The innertube's section height (the distance between the rim seat and the tread surface) is 4 inches.
Straight valve
Rim diameter: 8 in.
Section height: 4 in.
Consistent extrusion process eliminates thin walling problems common with other tubes
Comment