AUTHOR Tube AT-CROSS-700C FV40

Tube AUTHOR 700x25/38C. 100% all butyl rubber made with extremely air-tight. Keep air pressure in bicycle tyre longer than cheaper tubes made of syntehtic rubber. 

• Presta valve 40 mm.
• Less air loss = having to inflate less.
• 100% quality control, each AUTHOR tube is individually examined at the factory to ensue air-tightness.
• ETRTO 25/38-622/635.