The Blackburn Heavy Duty Bicycle Inner Tube with Tire Levers is designed for 20" wheels with a size range of 1.75-2.25 inches. The tube is 20% thicker than standard tubes to help prevent flats, making it ideal for cyclists looking for added durability while riding. The Schrader valve makes it easy to inflate, and the bonus inclusion of two tire levers adds a convenient extra element to this essential cycling component.