As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TAXIING PRIOR TO TAKEOFF THE NR 3 MAIN GEAR SUB WHEEL FAILED WHERE THE DEMOUNTABLE FLANGE RETAINING RING IS SEATED. THE DEMOUNTABLE FLANGE, RETAINING RING, SEAL AND TIRE DEPARTED THE MAIN GEAR SUB WHEEL WHICH REMAINED ATTACHED TO THE AXLE. AIRCRAFT TAXIED BACK TO BASE FOR MAINTENANCE.