CushCore Trail Tire Inserts are the truth. A foam insert that mounts inside your tubeless tire, they allow you to run lower PSI without putting your rims at risk. Not only do they let you drop pressures for gripping everything in your path, they act as bead-lockers, internal tire dampers, and potential weight-savers. They weigh about as much as a tube, but they allow you to run lighter tires and rims than you're used to. The choice of EWS champs and local heroes, the CushCore Trail Tire Inserts With Valves will absolutely improve your riding and your on-trail experience.