Top quality Schwalbe branded inner tubes. Best quality inner tube for a bike.
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Who would have thought there could be such variability in the quality of something so simple, but if you have ever bought a bad inner tube you will understand. Schwlabe tubes are all inflated at the factory level to ensure they are leak free. The tube thickness is balanced and consistent, no weird bulges or weak spots. The valve stems are metal to ensure they arent damaged by the rim.