The Specialized Standard Tube is ideal tucked into a saddle bag for those sudden punctures. Whether youre a daily commuter or casual rider youll always want a spare on hand for roadside fixes.These Standard Tubes are tough to help prevent punctures and go up nice and firm. Lightweight and sturdy they come in a range of wheel sizes to suit your needs. At 0.8mm thick these tubes have less rotational weight than a standard tube - every little helps.FeaturesPresta valve compatible0.8mm thickMany sizes availableLightweight and sturdyMatch the inner tube size to your wheel diameter and tyre width (found on your tyre sidewall). We stock inner tubes for 700c road bike wheels, 24" kids bike wheels and 26", 650b (27.5") and 29" mountain bike wheels. See the tubes guide tab for more information. Also available as a 2-Pack on selected sizes....https://www.tredz.co.uk/.Specialized-Standard-Inner-Tube-Presta-Valve-2-Pack_250525.htm