The BELL Standard Bicycle Inner Tube is designed for road and hybrid bikes, fitting tire widths of 35 to 43mm. This high-quality inner tube is made from mold-cured butyl rubber, ensuring durability and preventing high-pressure blowouts. It features a Presta valve with a length of 40mm, making it easy to inflate and maintain. Ideal for cyclists looking for a reliable replacement tube, it is suitable for various bike sizes, including 27 inches.