Features: High strength center lock structure provides strong braking force during intense cycling and resists rotor stress. The bike disc brake rotor is made of aluminum alloy and high carbon steel, offering high strength, resistance to deformation, excellent rust prevention, and wear resistance. The polygonal airflow design and large hole spacing enhance heat dissipation, reduce brake fade and warping, and ensure reliable braking performance. Delivers consistent performance in both dry and wet conditions, with good wear resistance, fast ventilation, and efficient heat dissipation. Suitable for front and rear disc brake systems; easy to install. Specifications: Materials: Aluminum Alloy and High Carbon Steel Style: 140mm A / 160mm B Color: Black / Red / Purple / Pink A Diameter: approximately 140mm / 5.51 inches B Diameter: approximately 160mm / 6.3 inches Package Includes: 1 x Bike Disc Brake Rotor Note: Please allow 1-2cm measurement variation due to manual measurement. Check monitor settings as display colors may vary from actual product color.