The Shimano SM-Rt64 Centerlock Disc Brake Rotor - EXTernal Serration is a high-performance component designed for cyclists seeking reliable braking power. Weighing in at a lightweight 135 grams, this rotor is crafted with precision to enhance your riding experience. The external serration design ensures efficient heat dissipation, reducing the risk of brake fade during intense rides. Compatible with Centerlock hubs, the SM-Rt64 rotor is easy to install and offers smooth, consistent braking performance in various conditions. Its durable construction and innovative features make it an ideal choice for both recreational and competitive cyclists. Upgrade your braking system with the Shimano SM-Rt64 Centerlock Disc Brake Rotor for improved control and safety on the road or trail.