The Cinturato SmarTube X is Pirelli's latest innovation in the world of tubes designed to offer performance-enhancing solutions for your endurance rides and gravel adventures. Made with thermoplastic polyurethane (TPU), a material that can save up to 70% of the weight while being stronger than butyl as a raw material. This product is 3 times thicker than a standard SmarTube, giving you the benefit of being agile while still being extremely protected. This allows you to face any type of terrain and riding conditions.overing the most commonly used sizes both on road and gravel set ups. - The volume of the Cinturato SmarTube X saves 50% of space in your pockets, while being stronger than a butyl tube and saving up to 70% of the weight - 3 times thicker than a standard SmarTube, allowing it to be extremely resistant and protected to challenge any obstacle on your ride - Compatible with disc and rim brakes