Tube AUTHOR SuperLite 27.5x1.75/2.35 with lover wall thickness. 100% all butyl rubber made with extremely air-tight. Keep air pressure in bicycle tyre longer than cheaper tubes made of synthetic rubber. Less air loss means having to inflate less. Extended French valve 40 mm. Lower wall thickness 0,65 mm – weight 155 g. Less air loss = having to inflate less. 100% quality control, each AUTHOR tube is individually examined at the factory to ensue air-tightness. ETRTO 48/54 - 584/597 # inner tube FVwhere to buyphotogalleryproduct options Photogallery Product options black27.5x1.75/2.35 = UA#37227202