The Shimano SM-RT66 6-Bolt Disc Brake Rotor is engineered for reliable and consistent stopping power across all riding conditions. With its durable construction and user-friendly design, it is ideal for mountain biking, touring, and other demanding cycling applications. Consistent Braking Performance: Built to deliver reliable braking power, the SM-RT66 ensures smooth and controlled stopping, whether you're tackling steep descents, wet trails, or rugged terrain. Its precise design minimizes noise and vibration for an enhanced riding experience. Secure 6-Bolt Installation: The rotor features a 6-bolt mounting system with an anti-loosen plate construction. This design ensures a secure and stable fit, making installation quick and easy while maintaining safety and reliability during intense rides. Durable and Heat-Resistant Construction: Made from high-quality materials, the SM-RT66 rotor is built to withstand heavy use and high temperatures. Its robust design ensures durability, even under extreme braking forces, making it perfect for aggressive riding styles. Optimal Heat Dissipation: The rotor is designed to dissipate heat efficiently, reducing the risk of brake fade during prolonged braking or technical descents. This ensures consistent performance and greater confidence on challenging trails. Compatible with a wide range of Shimano disc brake systems, the SM-RT66 rotor is suitable for mountain, hybrid and touring bikes.