A simple formula for a simple application but funny how the competitors manage to miss the details. Mold-cured, seamless-extruded, with removable valve cores are features that make Continental tubes a step above the rest. This all-purpose inner tube also makes an excellent replacement inner tube for your road bike. Seamless construction, with a mold-cured vulcanization, ensures uniform roundness and give a smooth ride and handling. Each and every inner tube passes a stringent 100% quality control inspection.