Pirelli Cinturato Smar TUBE Tube Oh Yeah, It's Big Brain Time Lightness plays a key factor in how fast a wheel can rotate. With a lighter setup, your wheels can rotate faster and you can accelerate more efficiently. The Pirelli Cinturato Smar TUBE Tube is designed for gravel adventure and endurance. This tube is made of Thermoplastic Polyurethane, also known as TPU, making it lighter, more compact, and as resistant against punctures as an equivalent tube made of butyl. Features Ultralight at only 70g for a 28-35mm gravel tube Made of TPU that is lighter and just as durable as butyl tubes More compact so you can pack more in your bag SPECIFICATIONSWheel Size700c, 650b Width28-35, 33-45, 35-45, 40-50mm Valve Type Presta Removable Core-Stem Length / Type60mm, Not Threaded Weight45g - 110g | Pirelli | Cinturato Smartube Tube 650 X 40-45Mm, 60Mm | Polyurethane