These are no ordinary bicycle tubes! These extra strong inner tubes stop flats for 2 years because there is Slime inside. Works on bicycles, wheelbarrows, wheelchairs, jogging strollers and much more. Check out our quick tube guide (https://www.slime.com/us/blog/how-to-pick-the-right-bicycle-tube-size.php) to help you select the perfect tire tube for your bicycle. No more flats for 2 years!