What is a pyramid bicycle rim strip?

Pyramid bicycle rim strips are strips of material, typically rubber or plastic, that are applied to the inside of bicycle rims to create a smooth surface for the inner tube to rest against. This is designed to help reduce the risk of punctures or tears in the tube from uneven or sharp surfaces. Pyramid's bicycle rim strips are renowned for their durability, flexibility and resistance against punctures and tears. They provide optimal protection for bicycle tubes and are often considered a reliable and cost-effective option for cyclists seeking a smooth and safe ride.