1.STEEL MATERIALS: The Cycling bicycle flywheels use high-quality high-strength steel, which uses hardening technology as a whole to make the chain more wear-resistant and durable. Even in a harsh environment, it will not be easily damaged. 2.EXQUISITE MANUFACTURING PROCESS: The high-strength bicycle flywheel is made of superb salary. The overall strength is high, high temperature, corrosion resistance, rust-proof, non-deformation, high durability, good impact resistance. 3.HIGH-PRECISION: The flywheel has strong impact capacity, high tooth shape accuracy, and strong compatibility, 7 Speed Sprocket Bicycle Freewheel ensuring the stability in the cycling process, even high-intensity rotation will not affect the stability of the bicycle. 4.HOLLOW DESIGN: The high-precision gear adopts a unique hollow design, which reduces the overall weight of the flywheel while increasing the speed, reducing the riding load, and ensuring the strength of the flywheel and the balance of the bicycle.