What are the key features and benefits of the SRAM S7 gear system for bicycles?

The SRAM S7 gear system for bicycles offers a smooth and efficient shifting experience with 7 speeds to choose from. Its key features include a reliable internal hub design, easy maintenance, and a wide gear range for various terrains. The benefits of the SRAM S7 system include improved performance, reduced wear and tear, and a cleaner appearance without external gears or derailleurs.