- All of Schwalbes inner tubes are 100% recyclable and are inflated for 24 hours and tested for leaks at the factory before being shipped. Schwalbe inner tubes all have a very high butyl content and a high material purity. SV17 700c Inner Tubes * Weight: 150g * Presta Valve * SCT013 - 28c - 45c (50mm Valve) * SCT014 - 28c - 47c / 27" x 1" 1/4 (40mm Valve) * SCT014A - 28c - 47c / 27" x 1" 1/4 (60mm Valve)