The Silca Latex Tube w/ Speed Shield provides everything that's needed for lightweight, reliable, and secure tire inflation. With Silca's Speed Shield and Valve Extender included with the tube, your rim will be protected from any obnoxious valve-related noises, while decreasing the chance of tears or pinches at the valve stem. You might be asking yourself, "Why Latex?" Compared to standard bicycle inner tubes which are made of butyl rubber, Latex is significantly more elastic (10x elongation compared to 2-3x), but more importantly, Latex Rubber has significantly lower coefficient of damping which means that when latex rubber is stretched or flexed, it returns to shape faster and with fewer energy losses. What does this mean for an inner tube? Latex inner tubes are generally 2-5 Watts (per tire) more efficient at 30mph than tubes made of other materials, are harder to pinch-flat, and offer superior suppleness and road feel, especially when combined with supple, low rolling resistance tires. The Silca Latex tube has been sized to fit tires measuring 24-30mm, which will equate to 23-28mm tires used on modern wider rims. Valve stem length is 42mm and will work in all modern disc wheels.