Maxxis Ultralight 700x23-32c Tube 48mm Presta Valve Removable CoreMaxxis 700x23-32c Ultralight Tube. Maxxis ultralight tubes are the standard in performance inner tubes for racing and training. Ultralight tubes are 0.6 mm thin for weight consideration without loss of performance. Features a 48mm Presta Valve with removable core. Weighs only 75g.4717784038742