All EBC Premium Discs are cast to a material strength of 150 N/m2 with a tightly controlled surface hardness variation less than 20 HB and are precision CNC machined to a surface tolerance of less than 0.05 mm. That is TWO THOUSANDTHS of an inch. For this reason EBC recommends a maximum runout of fitted rotors of 0.1 mm or .004 inches (4 thousandths) TIR which means total indicator reading on a dial gauge.
For more information about this product please call 1-888-51BRAKE (1-888-512-7253) and one of our sales representatives will be happy to assist you.