What was found
OKC INFLIGHT - AT LANDING GEAR RETRACTION CREW REPORTED SEVERE VIBRATION FROM NOSE GEAR AREA. VIBRATION GOT WORSE AS AIRSPEED INCREASED. CYCLED GEAR DOWN AND VIBRATION WENT AWAY BUT CAME BACK WHEN GEAR RETRACTED. ALL GEAR INDICATIONS NORMAL AT ALL TIMES. RETURNED TO OKC AND LANDED WITHOUT INCIDENT. RELATCHED NOSE GEAR AREA AND VERIFIED LOCK ENGAGED. FOUND LEFT NOSE TIRE WORN. REPLACED WHEEL ASSEMBLY. SYSTEM GROUND CHECKED NORMAL OPERATION.