Tire sealant is a must for every tire change. The Onewheel comes from the factory with sealant in every tire. The rubber used for Onewheel tires is extremely soft and punctures easily. Without sealant you will find yourself with a flat sooner than later. Luckily for us we have Tire Candy! Tire Candy can fill/repair punctures caused by objects up to 1/2" in diameter.