International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. Optimized gradation and gear ratio Improved drive efficiency, allows for more frequent driving on the most efficient chainring HG cassette with smooth and precise gear changes Improved drive efficiency, allows more frequent driving on the most efficient chainring Gradation and gear ratio optimised Lightweight, minimalist and visually attractive design