The Proterra ST900 tire is a commercial bus tire manufactured by Michelin specifically designed for electric buses like the Proterra ZX5. It features a wide tread design that ensures exceptional tread wear, even pressure distribution, and reduced rolling resistance. The tire is also made with a special rubber compound that provides superior traction on both wet and dry surfaces. Additionally, the tire has a reinforced casing for better durability, handling, and ride comfort. With its outstanding performance characteristics, the Proterra ST900 tire is one of the best choices for electric buses.