the zero tube is an ultra-lightweight tube that is about 1/3 of the weight of a regular tube. the tcu (thermoplastic polyurethane) material allows for lightweight construction that can make a huge difference in the feel of your bike. 38mm long schrader valve.
20" x 2.125"-2.5" weight=58g/2.05oz
26" X 2.125"-2.5" weight=74g/2.6oz
27.5" X 2