What was found
(CAN) ON ROTATION, STRONG VIBRATION FELT FROM NOSE GEAR. TOWER ADVISED, PIECES OF RUBBER AND METAL FOUND ON RUNWAY AFTER TAKEOFF. RETURNED TO RAMP. REPLACED BOTH NOSE WHEEL ASSEMBLIES DUE LT NOSE WHEEL TIRE TREAD HAD SEPARATED. LT NOSE SKI TO WHEEL SEAL RETAINER MISSING. OFF CANADIAN PART NUMBERS, LT WHEEL & TIRE 7-3241-9-0022 S/N 0315, ON S/N 2169. RT WHEEL & TIRE 7-3241-9-0022 S/N 3687, ON S/N 0203. WHEELS & TIRES REPLACED AS PER WORK CARD 4147. TRIMMED SEAL AND REMAINING SEAL RETAINER. OVERWEIGHT LANDING INSPECTION COMPLETED AS PER WORK CARD 4041. AIRCRAFT OK FOR SERVICE.