The Specialized Inner tube is a favourite amongst many cyclist. The quality rubber has been replied upon for many miles and over many year. Specialized use a moulded method of construction, ensuring a consistent thickness of butyl. The Specialized inner tube is available in a range of widths and valve lengths to suit most tyre sizes. It is made from butyl rubber. Weight: 112g. Available valve lengths: 32MM, 40MM, 60MM, 48MM, 80MM. Available sizes: 26X1.0/1.25, 29X1.75-2.4, 700X20/28, 700X28/38, 700X20/28, 650B/27.5X1.75-2.4.