What was found
EMERGENCY DECLARED, LANDING UNEVENTFUL & ACFT NOT OVERWEIGHT. DURING TAKEOFF, NOSE GEAR HAD ABNORMAL VIBRATION & WOBBLE BUT RETRACTED SUCCESSFULLY. ON EXTENSION AT NOSE GEAR APPEARED TO HAVE SLAMMED DOWN & FLIGHT ATTENDANT REPORTED GRINDING NOISE. PERFORMED FIM 32-51-00 & FOUND NOSE GEAR TIRE ASSEMBLY OUT OF ROUND & PRESS LOW. R & R TIRE ASSEMBLY IAW NIC 32-96-51. OPERATIONAL TEST IAW 32-3400. SYS CHECKED NORMAL.