The Shimano SM-RT70 Disc Rotor is an SLX or 105 level rotor that manages heat and provides confident stopping power. It is made with Ice-Tech Construction which features a stainless steel braking surface and an aluminum core. The aluminum is responsible for heat dissipation which prevents overheating at the surface. It offers high stopping power while holding up over long periods of time with no wear. This is a center-lock rotor and it is compatible with all axle types. The Shimano SM-RT70 Disc Rotor is durable, reliable, and affordable with great braking performance.