Apart from the quality of the ingredients, the purity of the rubber mixture is crucial to the quality of the tube. The base material is therefore sieved at enormous pressure through seven filters before being extruded. All tubes are inserted into a mould and inflated for vulcanization to ensure constant wall thickness and high air pressure retention. All tubes are inflated and stored for 24 hours in order to test for air pressure retention. Afterward each, individual tube undergoes a careful visual inspection.
|Model Name||Schwalbe SV21F 27.5x2.1-3.0|
|Valve type||Threaded Presta Valve|
|Avalaible valve lengths||40mm|