Tubolito S-Tubo CX/Gravel All Tube - 700 x 32-50mm 60mm Presta Valve BlackTubolito S Tubo CX Gravel All Tube 700 x 32 50mm 60mm Presta Valve Black. Developed to fit in any small pocket the lightweight S Tubo CX Gravel tube is the ideal spare and more. Not only a savior in need the tube can be used on a daily basis as its still as robust as standard rubber tubes but with a lower rolling resistance for an advantage over the competition. Leftover tubeless liquids do not do any harm to it as well. S Tubo series tubes are