As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. DFW, AIR INTERRUPT, DFW-LIM. EMERGENCY DECLARED. LANDING UNEVENTFUL. DURING TAKEOFF ROLL, EXTREME AIRCRAFT VIBRATION WAS FELT JUST PRIOR TO ROTATION. MAINTENANCE FOUND TREAD SEPARATED FROM THE LEFT NOSE WHEEL TIRE. REMOVED AND REPLACED WHEEL ASSEMBLY IAW AMM 32-45-02