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Tube
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700x35/50C FV 40 mm
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CROSS-700C 28"
 
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 35/50-622/635.
                            
                                      
