100x4,M12x1.5,tapered roller bearing Casting number on the brake drum: 278.991.... Inner diameter of the brake drum: 160 mm Width for brake shoes: 35 mm Wheel connection: 4 x 100 Thread: M12 x 1.5 Built-in wheel bearing: LM 11749/710 + LM 45449/410 built-in sealing ring: 701511