Zipp 700 19-23 presta tube

Efficiency starts here.

Unlike standard inner tubes, Zipp's Tangente Road Tube is specially designed to reduce rotational mass at the valve area and improve a wheel's overall rotational stability. This is accomplished thanks to special lightweight aluminum Presta valve stem, which is only available in a 37mm length, but it features a removable core for easy use with Zipp's inline extenders. Zipp uses a 0.60 mm butyl thickness for the tube itself, delivering increased durability and more reliable performance compared to other "super light" tubes.

700c x 20 - 28 mm. Claimed weight is 72 g.