When it's time to swap out your tube, Q-Tubes make it easy with reliable construction and sizing that fits a wide range of tires. Both the 18in and 24in options feature a standard Schrader valve, a . 9mm wall thickness for durability, and smooth shaft design for straightforward installation. Whether you're setting up a kid's bike, BMX, or a 24in cruiser, these tubes are a dependable replacement that keeps your wheels rolling.