The Schwalbe tube No. 13F fits 26" tires with a width of 54-75 mm and is typically used on mountain bikes. Compared to its sibling, the 13D Downhill, the Schwalbe Freeride is the lightweight, weighing about 36% less. Due to their excellent manufacturing, Schwalbe tubes have proven themselves in the market for years. They have a consistent wall thickness and are round in shape. Their precise construction makes them durable at the seam. A comparative test showed that the Schwalbe tube maintains air pressure significantly longer than other tubes, which lost nearly twice as much air pressure in 30 days. A possible reason for this could be a lower butyl content in the other tubes. The exceptional quality of Schwalbe tubes arises from the uniqueness of their rubber compound. To ensure this high quality, each individual Schwalbe tube is inflated and inspected for at least 24 hours before leaving the factory.