The Acera component group stands for three qualities: accuracy, precision, and aesthetics. This group enables precise shifting with less loss of pedal power. It offers high braking force and excellent braking performance for precise speed control, as well as an attractive appearance with a sleek profile. Technologies: HG-Hyperglide. In conjunction with Shimano Hyperglide chains, the HG cassette sprockets guarantee fast, precise index shifting functions. The specially computer-designed sprockets feature specific tooth profiles and strategically positioned climbing aids that optimize chain guidance during shifting. The result is fast, smooth, and silent gear changes.