BOSCH Front Brake Height (unpacked)= 42 mm Diameter (unpacked)= 254 mm Number of holes= 4 Hub diameter= 55 mm Maximum thickness= 22 mm Minimum brake disc thickness= 20 mm Coating (oiled) Disc thickness variation (DTV)= 10 µm Lateral runout= 50 µm Pitch circle diameter= 100 mm Brake disc version (ventilated) Maximum mounting hole diameter= 13.1 mm