Light weight version designed for cross-country racing, light trail riding, and/or less aggressive riders. CushCore XC allows you to push the limits of your tires and suspension to new levels.These are not just tire inserts, but tire suspension. Add a damper to the air spring that is your tire! 50% less force on big hits, best-in-class rim/tire protection and impact absorption 16% less suspension travel used for the same impacts, absorb force before it even gets to your suspension 12% less G-force on the handlebars, ride longer and more in-control 35% increased sidewall stiffness, prevents tire burps and improves ride quality 25% less lateral tire deflection, no awkward tire roll in corners and hold lines better 3.2% less rolling resistance than tubeless Run-flat capability Includes CushCore tubeless valves Tire Widths: 1.8″-2.4+″ Inner Rim Width: 22mm-32mm Weights: 27.5" – 140g, 29" – 150g