The RoadTUBE is the modern interpretation of the classic butyl inner tube used by millions of cyclists around the globe. The RoadTUBE takes advantage of the practicality and reliability of butyl in a modern and advanced application focused on performance and lightness. The result is a lightweight cycling butyl tube which is perfect for everyday use and as a spare tube. 700mm x 23-30mm. 85g. This tube has a removeable valve core.