Consist of aluminum alloys extremely high strengths and light weight characteristics ensuring durability and stability in mountain cycling. Convenient for maintenances and replacement, users can choose different lengths or types of cranks according to their needs, enhancing personality . It can effectively improve the efficiency of pedals rotation, enhances cycling comfort and response speed. Provide a better pedaling and reduce fatigue caused by prolonged cycling. Provide cranks of different lengths and styles to meet the needs of different height and cycling styles, with strong adaptability.