The Shimano SLX SM-RT70-LE Disc Brake Rotor in 203mm silver is a top choice for high-performance and reliable braking in any riding situation. Its unique 3-layer design features an aluminum core surrounded by two stainless steel layers, resulting in a significant reduction in rotor surface temperature. This rotor also comes with an aluminum spider and an external serration lock ring, which requires an external-type rotor lock ring for installation on a 15/20mm axle hub.