An insert for a pneumatic tire including an annular member adapted to contact at least 10% of an interior surface of the pneumatic tire and provide an outward pressure thereagainst. An insert for a pneumatic tire including an annular member adapted to contact at least 10% of an interior surface of the pneumatic tire and provide an outward pressure thereagainst, and an inflatable bladder disposed adjacent to the annular member. A tire assembly including a pneumatic tire having an interior surface and an annular member contacting at least 10% of the interior surface and providing an outward pressure thereagainst.