Magura MDR-P Disc Brake Rotor - 180mm 6-Bolt Silver/BlackMagura MDR P Disc Brake Rotor 180mm 6 Bolt Silver Black. The Magura MDR P is a disc rotor for performance oriented riders and tough tasks ranging from downhill and ebikes to heavy cargo bikes. It features Dovetail Interlink technology a patented interlocking of the outer and inner rings. This provides additional support for the inner ring if the outer ring expands due to heat. In contrast to floating discs the torque is transmitted to the dovetail