Not only spare: developed to fit in any small pocket, 35 grams lightweight S-Tubo-CX/Gravel All due to its very small packed size is the ideal spare tube for all 700c and 650B tires from 30mm-47mm width. However, it is not only a savior in need but can be perfectly used on a daily basis as it still is as robust as standard rubber tubes. Also leftovers of tubeless liquids do not do any harm to it. Given its low rolling resistance it can also become the decisive advantage at competitions. Available with 42mm (35 grams) and 60mm (36 grams) Presta valves and suitable for disc brakes.