Devices for reducing tire noise

A noise damper, configured for use within a passenger, light-truck, or truck-and-bus-radial tire, comprising:

• a foam body, configured for use within a passenger, light-truck, or truck-and-bus-radial tire, the noise damper being configured to move freely within the tire,
• a thin film that attaches to the foam body,
• a lubricant disposed on a first side of the thin film to allow the noise damper to move freely against a surface of the tire, and
• an adhesive that bonds the foam body to a second side of the thin film, wherein:
• the foam body includes at least one generally flat surface that is configured to conform to a tire innerliner,
• the foam body includes a radial height and an axial length that is between three and six times the radial height;
• the foam body is made of compressible and elastic open-cell foam;
• the thin film has a generally flat surface that substantially coincides with the generally flat surface of the foam body;
• the thin film includes a radial height that is between 0.005-10% of the radial height of the foam body;
• and
• the thin film is made of ultra-high-molecular-weight polyethylene and has a coefficient of friction of 0.07-0.12.