The Nutrak 27.5 x 1.75-2.1 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 Presta valve. Key Features27.5\\\" tube, also known as 650B Renowned Nutrak quality and value Welded butyl rubber construction is robust yet lightweight 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