Genuine MAGURA MDR-P Rotor – 180mm. The genuine MAGURA MDR-P 180mm rotor is a high performance brake disc designed specifically for demanding eMTB and gravity riding applications. Optimised for eSTOP braking systems, the MDR-P features MAGURA’s patented Dovetail Interlink Technology, providing an exceptionally strong connection between the outer and inner rings for outstanding braking performance under heavy loads.