The Nutrak 700c x 35-45c Innertube is a great value replacement tube for road cyclists. A high quality inner tube at a reasonable price, with welded butyl rubber construction and a standard length Schrader valve. About NutrakFor over 20 years Nutrak has offered a great value tyre and tube range. Nutrak products are a careful blend of performance and value, delivering excellent all-weather performance at affordable prices. From strollers to BMX, and mountain bikes to road bikes, Nutrak\\\'s comprehensive range covers a wide range of sizes to suit all cyclists\\\' needs for everyday use. Inner Tube Buying Guide