Rimpact's race-proven insert, cut down for speed. Built on the test-winning PRO V2 platform, the Race Edition trims 20% of the rotational weight and 24% of the profile, which means less inertia, easier fitting between race runs, and still a huge step up in protection over running bare. Developed directly with World Cup DH and EDR racers who need quick tire changes and minimal added mass, without giving up flat protection when it counts. Tubeless valves are included. Rimpact Pro Race Edition Specs Insert Size: 55mm wide, 6mm PRO layer Wheel Size: 27.5", 29" Internal Rim Width: 25mm-35mm Tire Width: 2.40" - 2.60" Weight: 125 grams (27.5"), 130 grams (29") (per insert) Compatibility Requires an insert-compatible valve. Use ~25% more sealant than the standard dose. The insert is closed-cell and won't absorb fluid, but needs extra coverage on its surface.