The CushCore XC Single Tyre Insert is a lightweight version designed for cross-country racing, light trail riding and/or less aggressive riders.Tyre Widths - 1.8"-2.48"Inner Rim Width - 22mm-32mmWeight - 140g (27.5") / 150g (29")Includes 1 x CushCore tyre insert, 1 x 44mm CushCore green Presta air valve and 2 x rim stickersNot all tyre inserts are created the same. CushCore is no ordinary tyre insert and is based on a new concept, tyre suspension. Any suspension system has a spring and a damper, and with CushCore, pressurised air in the tyre is the spring and the CushCore tyre insert is the damper. Like traditional suspension, a constant damping force wouldn't work. It must be dynamic. Suspension should be supple on small bumps but firm on the big hits. CushCore responds differently depending on the tyre load and scenario. The more the tyre flexes, the more damping it provides.Go Bigger - CushCore improves suspension performance by 16% and reduces impact force from big hits by 50%. S